Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b78314a0a7be9d8…

MALICIOUS

PDF

120.4 KB Created: 2021-04-08 05:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9ce8014507b421462157a9373dfdaac5 SHA-1: 9ab26017e12d990fa0b9e2099b9b88b0e3051b0b SHA-256: 3b78314a0a7be9d84e7f26ab5212522fb344eeffda6f64742f3d604231fb27c7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The embedded content appears to be obfuscated or corrupted, preventing a deeper analysis of its specific intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=beaba+babycook+original+plus+manual PDF link annotation
    • http://sovetnik53.ru/satodamesururiar4n3.pdfIn PDF document text
    • http://profapp.pro/energy_guide_label_lookupo2y1h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fd5d7f28-aa84-4866-adf4-fde06f18eec7/wubepekesefusode.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/84391860800.pdfIn PDF document text
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_56d00945c994428f926274a64fce0143.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/cielo_brazil_annual_report.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_2269944d57e8431888b2ea1f75c42604.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2c720c-0006-41d8-8348-97c34dc17ca5/how_to_replace_a_walking_belt_on_treadmill.pdfIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_a1dc5bab273f491eb87570596ec25222.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/12023663974.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/brute_snowblower_parts_canada.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_dfe5bca4d8ff4d7587a14a7b2d08260e.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_3e3fc31d61be43f5a1115c7abbf85a91.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_115e79ae6e104c9682b2500ea21448b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bfb301-d435-437c-becd-c2df218e9254/bevebenalasivaxejosiwisot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e68624-3e86-49b9-bec5-fd8ff1e27055/how_to_replace_battery_in_schumacher_jump_starter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f92ac18-ed25-4cf2-85ec-e6c62c11f103/sarenezapege.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_616bf160b017414f861f49bb03320a6d.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_7da529a22c3241d0a1661c5a5fb1ccfc.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_1bd39e13b594458a904daba3e23204bf.pdf?index=trueIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_c8bdfa7e60854f96a0be1320101624fc.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d2b9222768d14284a63c97b70c462bfe.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_5066587e18544cceaafe39b97b17b503.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_2a648d14096744fd88d77db527559448.pdf?index=trueIn PDF document text
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_8716368194574db490b58bfc28dc4b63.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E69 5408 bytes
SHA-256: 82a2f238f7654ab60ead64c7cf82a64edf16be1acf189a83c7f68a80c98dfed1
font_01_sfnt_off000180b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180B3 14556 bytes
SHA-256: a8e1ee42e0f3475dce60918d755ae9cba9f7bf786c442fe6f6e90a711a45e096
font_02_sfnt_off0001ae4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE4A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off0001c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C377 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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