Malicious PDF — malware analysis report

Static analysis result for SHA-256 e297a7320fdb6e3e…

MALICIOUS

PDF

76.9 KB Created: 2021-03-31 00:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48b288d8d456b10b626478cc443df457 SHA-1: d82fed51985b51de55e081cc529a850b791af402 SHA-256: e297a7320fdb6e3e1fb14d42fbd89763309975f3cb96b078675dbf0579645f47
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to zajinet.ru, suggesting a link farm or SEO spam tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of many external links and the document's deceptive content indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=sample+letter+to+judge+asking+for+leniency+for+son
    • https://cdn.sqhk.co/benanejufa/gjApFDo/ultimate_car_driving_simulator_drift.pdf
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/83b51bfc32ff.pdf
    • https://cdn.sqhk.co/zuvomafoda/pghA6mq/37304357564.pdf
    • https://cdn.sqhk.co/jekefebiba/SDHtjfn/q_parent_connect_jusd.pdf
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/megabewavepo_pozezup_repababule.pdf
    • https://cdn.sqhk.co/parikozug/bx6Pgjo/20443518569.pdf
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/timiwepomi_kugewadibosa.pdf
    • https://cdn.sqhk.co/lojosexotak/cjghbLy/choice_of_magics_romance.pdf
    • https://cdn.sqhk.co/rakuvonume/Mjjgdjc/4722684006.pdf
    • https://cdn.sqhk.co/sixojifez/Ygikha6/tesobikonalefilusideje.pdf
    • https://cdn.sqhk.co/povewepalu/qgjFejh/6907231367.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pexodugosa/aaron_rodgers_injury_report.pdf
    • https://s3.amazonaws.com/vovopafubipu/supply_chain_management_software_gartner.pdf
    • https://s3.amazonaws.com/zalomi/agent_performance_report_format.pdf
    • https://s3.amazonaws.com/purixifusipelid/85883690933.pdf
    • https://s3.amazonaws.com/bajapovogam/3621664867.pdf
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_8d841a9b1aec447da4ac505284bf2493.pdf?index=true
    • https://s3.amazonaws.com/navoburarovada/bio_lab_report_introduction_example.pdf
    • https://s3.amazonaws.com/luworizesupox/browser_ringan_tanpa_iklan_android.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_c2326d40248c48738b388f37774e6dad.pdf?index=true
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_9ccc6b8c9cda4fc1b732770c3338ea43.pdf?index=true
    • https://2521c3e2-5736-45bb-9381-71005f2ffa37.filesusr.com/ugd/c85705_1d0d987ec98f459b93beab6a23323807.pdf?index=true
    • 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_off0000ee73.bin
a98b6696d3b8a5acc357b25e3bf1cc85a0b48b1518cb2c8d3ec77102fb1040dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 5820 bytes
font_01_sfnt_off00010241.bin
353ff77755cf70e457dc3bb7e755ae77129738638de851d4abfafdf261ddee78
pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 10480 bytes