Malicious PDF — malware analysis report

Static analysis result for SHA-256 597b36e12392d3f3…

MALICIOUS

PDF

63.7 KB Created: 2021-04-06 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4bad6b4ae2a548a7e9f5adf8ecc4df7c SHA-1: 65ee211e0a3ee22a6f049069a7152dacd8a54537 SHA-256: 597b36e12392d3f3888b3b300d4d8b6fc729af080ed3aebd3f4ac116a9c4c3d6
124 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it functions as a link farm on disposable hosting, directing users to various external PDF files. While no scripts were explicitly extracted, the nature of the embedded URIs suggests an intent to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 4

  • 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
  • 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/award?keyword=sheekkoo+afaan+oromoo+pdf PDF link annotation
    • https://cdn.sqhk.co/dugixikisim/Nd1hbja/univision_noticias_hoy_usa.pdfIn PDF document text
    • http://freedate18.xyz/pegatron_corporation_2ac2hut50.pdfIn PDF document text
    • http://verifiedbadges-form.com/sonic_heroes_gamecube_downloadeetfg.pdfIn PDF document text
    • http://vilopeg.xyz/design_sprint_2._0hu070.pdfIn PDF document text
    • http://bit7.top/959557419328uw0g.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/adl9NVI/snapchat_icon_aesthetic_neon_blue.pdfIn PDF document text
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/fojize-juwasenud-gotitoj.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/gcfHg0x/boulangerie_dallas_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/dinewemilo/jaF2Ljb/84217132021.pdfIn PDF document text
    • https://wibotutez.weebly.com/uploads/1/3/4/0/134012840/jemojib.pdfIn PDF document text
    • http://flowerport.store/gattaca_viewing_guidelqlnm.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/725d1b53f.pdfIn PDF document text
    • http://reweder.site/what_does_bible_says_about_lonelinessnyo2x.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/99881a00-e6f6-4f4a-8f51-cdb8912dbd6a/world_history_book_10th_grade_california.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_be5496068dd94fce971ef4f055180337.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2b2a85-e776-4408-962c-36dbd33f21b2/9347358350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bc4af7-b352-4e44-b8ae-0e24284d9018/good_books_for_middle_schoolers_fiction.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_80ce6b055b7a471ebed3a68dd246c31b.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 5240 bytes
SHA-256: ed26aaa161685fe0f1b12f372c63d49e46008e5358a59fc7c1a65b66477171a3

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