Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bb40c47884e4f0…

MALICIOUS

PDF

89.6 KB Created: 2021-03-20 07:04:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170be6840833db99ade2423f9fff93bb SHA-1: ebe18a36c8d5ff3a6450efed765d33c08cef3cdb SHA-256: a2bb40c47884e4f0521d76d17e978893ebd4274193f83bcaa605d3587305661d
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and SEO link farm attack. It contains numerous external links, with one pointing to zajinet.ru, suggesting an attempt to redirect users to potentially harmful content or for SEO manipulation. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass gateway scanning by requiring a password for an associated archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/wix?keyword=manual+de+discipulado+basico+iciar
    • http://pomirkapa.site/the_witchs_islehtep6.pdf
    • https://cdn.sqhk.co/kerosumumato/LifbYhd/44821079046.pdf
    • http://djami.ru/monarch_10ee_toolroom_lathe_for_salexaa8o.pdf
    • https://cdn.sqhk.co/tibidimewako/hhSwKnC/capsule_wardrobe_fall_2020_plus_size.pdf
    • https://cdn.sqhk.co/bidusowo/jaqja2F/814172619.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_cee1f8e5433b49b4bf8a7ed0f05d7361.pdf?index=true
    • https://s3.amazonaws.com/pexodugosa/rewazaxijemofufev.pdf
    • https://uploads.strikinglycdn.com/files/0d9d1804-cd8c-4a43-a4ba-b93820ac16b7/pavuganigamokatozepaxo.pdf
    • https://s3.amazonaws.com/jivamubug/76018263024.pdf
    • https://s3.amazonaws.com/bupaxomu/black_mamba_transformers_ls-_03.pdf
    • https://s3.amazonaws.com/kovozenamofox/32961129108.pdf
    • https://uploads.strikinglycdn.com/files/e5adb75f-817a-49f6-aa8f-29ecf9d611ef/present_perfect_simple_exercises_3_eso.pdf
    • https://s3.amazonaws.com/limepusotanal/is_the_one_punch_man_challenge_safe.pdf
    • http://zatesivixif.epizy.com/54391241042.pdf
    • http://zexubadisaki.rf.gd/59558853484.pdf
    • https://uploads.strikinglycdn.com/files/2b78c8a2-673c-433f-b28b-08a745c3e21a/59972175370.pdf
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_be3ca14b5b80441399e404dfc745c48d.pdf?index=true
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_c8031e2b095643f08f46d4006ee08120.pdf?index=true
    • http://jitumevadegoz.rf.gd/clarivate_analytics_endnote_libguide.pdf
    • https://uploads.strikinglycdn.com/files/37d1b2ae-84c3-44ec-8cdf-483f164e343c/pibadidubolofa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d44.bin
08562447c814edd1d1e967443245d50778f5b76b3a24d59a07d48a7da59d2a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 5212 bytes
font_01_sfnt_off00012f0d.bin
5f0a55b49570ce02af68c94be8fddf966685fda5d529a72b406d01468d6e76e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 12724 bytes

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