Malicious PDF — malware analysis report

Static analysis result for SHA-256 18751ec060b87807…

MALICIOUS

PDF

70.2 KB Created: 2021-02-24 09:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4eb8c71628a9ea0345a4e51c285686f1 SHA-1: d4082ffab3644f7ac8cbfe9cf5238e4fab8debb5 SHA-256: 18751ec060b8780796311cf41c23338a8de5f20b59b8a987c6f8f97f177c8191
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 0.9998

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://maypoin.ru/123?utm_term=can+you+keep+a+buffalo+as+a+pet PDF link annotation
    • http://daxosivonoz.iblogger.org/stages_of_language_acquisition.pdfIn PDF document text
    • https://cdn.sqhk.co/gakilofod/diidgj6/table_tennis_rules_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/dicjg2U/worms_game_apk_free.pdfIn PDF document text
    • http://gbarb.me/19301446701rhu02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fdbe6f8468e3.pdfIn PDF document text
    • http://jedunoba.iblogger.org/ge_repair_contact_number.pdfIn PDF document text
    • http://wofeboz.66ghz.com/rezamawubivuwojeve.pdfIn PDF document text
    • http://vamoktin.ru/venom_carnage_unleashed_comicq77xr.pdfIn PDF document text
    • http://losiruwu.66ghz.com/information_about_invention_of_telephone_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/cgdjaja/42691705349.pdfIn PDF document text
    • http://wordwild-store.com/braun_series_7_790cc_manual0mm3x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453540/normal_602f856de7e8a.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/aT9Wibw/genevemipegob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazoverowagodi.epizy.com/dativebubifapoxifafifuxu.pdfIn PDF document text
    • http://joxowosikaze.rf.gd/basic_iq_test_questions_with_answers.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_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 5008 bytes
SHA-256: fe2fc9530022a7a30d9481ab6d3ab9a5217d5d6d03068b46a4d2c7a1198b219f
font_01_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 10236 bytes
SHA-256: 91068d72f3df75a4e7ef682449cfe990919e8b417ec025421ef0b7f3d1c4784d

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