Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac105abc96609da…

MALICIOUS

PDF

72.8 KB Created: 2021-06-12 00:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81510c104c6ef46f624cea75075cda8e SHA-1: 091220b6576ca19cf55cc191d45eeb005891232e SHA-256: 1ac105abc96609daab643f982c54c051784e2f8f7aade7621d94b5dd5d86527d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=warranty+card+format PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495257/normal_5fefd948e4f15.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/miwifekuk_xaxesolam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493201/normal_600349068cff5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416326/normal_6008d421f41fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_60b82efd16ae6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383300/normal_60b2e2c900f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_6032c9a7e7837.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/dejalenujiwipi_vuropo_rejekurowe.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/vegalok.pdfIn PDF document text
    • https://nonupipo.weebly.com/uploads/1/3/4/7/134767860/venujezogugafux-rowowuxuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_6064a710330b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601cdc62169d1.pdfIn PDF document text
    • https://pibubeje.weebly.com/uploads/1/3/4/3/134374065/5327015.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/bufas.pdfIn PDF document text
    • https://tarimewisu.weebly.com/uploads/1/3/0/7/130739021/f31ae2.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/jisogimuwasifaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f071c74d-eb26-4d1c-ab0e-7b5b31c99dc7/63634251472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b2bf1d-828f-4cbb-9367-a54687be9fa9/samsung_s7_edge_fm_radio_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406d0b48-da8b-44ce-954f-c9ea39b32c60/dubuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b337d84-09c0-4a10-a191-340755ee394b/dajikofetelofalonobolabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f59a03e-d856-4523-a8f5-2a5c88ac3966/how_to_play_minecraft_java_on_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8989b3-3367-45cc-92ae-2e6a99e7a53f/can_salicylic_acid_remove_dandruff.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 5072 bytes
SHA-256: 5bd631b940fdb97707e3e3537bd428f6d2e79c416d249684414025472235a483
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 10064 bytes
SHA-256: f9c2259ba71f11d2a3448400e84489a04bd32b1928931544b5af91be61fdc6d9

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