Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0f04dd6e4a8d0f…

MALICIOUS

PDF

76.9 KB Created: 2021-02-02 13:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0131749352900ed08e122253bd6fb369 SHA-1: ffffe9881d64198da229e9fd00590e0d63f068ed SHA-256: 5d0f04dd6e4a8d0fd7acc7cca3b9160c3519b29b3bfdb64b63ce8795b7e79efc
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

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://jottigo.ru/aws?utm_term=php+date+month+name+format PDF link annotation
    • https://cdn.sqhk.co/lafugafeniki/UiiC4fo/bendy_mod_apk.pdfIn PDF document text
    • http://knitfqph.site/rastafarian_prayer_book9hlef.pdfIn PDF document text
    • http://worldthailand.fun/riddle_quiz_questions_with_answersx76qe.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/nigogulukudexu_boduwegimevumo_gugidixinevegib_pataxij.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/femanafavepovaz_nigagaveduvape_xuresevof_tupik.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/jcgi0ig/tojowi.pdfIn PDF document text
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/dogilexexureluz.pdfIn PDF document text
    • https://fowerorizer.weebly.com/uploads/1/3/1/8/131856705/lizokipudifeveve.pdfIn PDF document text
    • http://forpost-electrica.ru/my_chicken_virtual_pet_game_hack_apkllseg.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/jupaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_6014ba59bfee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fe7235b09df0.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/Dixhajd/fancy_slime_make_slime_with_glue.pdfIn PDF document text
    • https://sewajevujunu.weebly.com/uploads/1/3/2/8/132814136/60c7bcd30ef.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/4066372.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/3igshft/superhero_hook_stickman_rope_swing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 5072 bytes
SHA-256: 78c290d48c5d64769c89465289e6278764357f8314525f626ce827fb5fc86084
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 11748 bytes
SHA-256: f178f8a8c067cc9e7213d89d8f34c1340ac67b0ed2688182b1a049e890490c4b

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