Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8a7338dd2e11d…

MALICIOUS

PDF

106.5 KB Created: 2021-03-22 21:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 386f300736e9ca56aa90d135c30bc1aa SHA-1: 7da4bb3cd76015fcb4d1c9b0c800b251526f5bac SHA-256: 5dd8a7338dd2e11d4e4af40141ff4ead35f567cc949f2d6289ac07e0c2e3343c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9972

Heuristics 6

  • 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 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://midufefew.ru/strik?utm_term=how+to+draw+a+boy+step+by+step+for+beginners PDF link annotation
    • http://miwasigal.mywebcommunity.org/berofebesibi.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/mibhggh/mazeganoxefegiwebib.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/lIheiiT/digi_online_hungary.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/67298081676.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/what_is_the_meaning_of_claim_adjudication.pdfIn PDF document text
    • https://cdn.sqhk.co/xovijanovupu/Kif21hb/avg_admin_center.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/lg_tromm_washer_error_code_fe.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/UBYrjif/40771410083.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/why_we_crave_horror_movies_rhetorical_analysis.pdfIn PDF document text
    • http://jarokixepoweso.mypressonline.com/simple_grammar_exercises.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/norudisupapufobubafak.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/TfCjg5D/makuvitenanewuwopivefib.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/21735644356.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/VWgakJ8/school_management_system_github_php.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://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_0dde849100614053b50f466b89908347.pdf?index=trueIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_b7d03335ecea4fc58571d61a94bf12e8.pdf?index=trueIn PDF document text
    • http://misanedajog.myartsonline.com/validity_test_in_research.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_f7dc21dbdc854eb28ba3074af6ac396b.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_dc872d7d65f24a12b8c796691f1d713a.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_067bcacb1ba04bc7a29d8a810729fa56.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_c54005eec309489da2ee00d38cc5ac07.pdf?index=trueIn PDF document text
    • http://viniwowosur.onlinewebshop.net/wayne_dalton_garage_door_torsion_spring_repair.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_35e74399aeeb4859895c4a0a3d2eb419.pdf?index=trueIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_dbb41b45dc5148e49837a3fee50915c1.pdf?index=trueIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_fd53cde6c9224f6ca1f4a1467c0ffe12.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001554e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554E 5260 bytes
SHA-256: aa1af094b04858c5b2f6d4ec5ed38dc43a2a5beaa1e6cee57defc9543fba33ec
font_01_sfnt_off0001674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674C 11160 bytes
SHA-256: 5297604789c42f8dbfd83944390d28ee76457b70dca6ee41fb3e21a3cfed5b81
font_02_sfnt_off00018d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D2C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34