Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2af374ffaf6e513…

MALICIOUS

PDF

76.8 KB Created: 2021-02-28 09:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f8142682980cb0f101ca2aabf2c1965f SHA-1: 8110396ea2e7ba071511b4ae21873ba538de8577 SHA-256: f2af374ffaf6e513182d2f0ebe41f06a57b60dfa8262a554c2eab1ce1f3a83be
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xezojetit.ru/strik?utm_term=free+kumon+worksheets+for+grade+3 PDF link annotation
    • https://cdn.sqhk.co/reriwoduriju/hhwhNhd/free_tv_guide_tonight_sydney.pdfIn PDF document text
    • https://suviliter.weebly.com/uploads/1/3/1/4/131453542/nujoratavekareta.pdfIn PDF document text
    • https://jeboxuxu.weebly.com/uploads/1/3/2/7/132710743/1b648b05dd6d7d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5fcf3e533b2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_600f491cbc202.pdfIn PDF document text
    • http://kozodomu.22web.org/studio_voice_recorder_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_602088c1401ad.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/jdibtJq/johnny_cash_cartoon_network.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410694/normal_5ffad9ecbdc48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_6038c8efd091f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378164/normal_600826b5f229d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60262dea839bc.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/0chcigX/joxokumudek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ff983184dc18.pdfIn PDF document text
    • http://xitigedomure.66ghz.com/metformin_500mg_tablets_side_effects.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_6000bdeb93dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_600f1724e5f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_6032a14672806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dokedajudelo.epizy.com/99890440380.pdfIn PDF document text
    • http://zogaxemajov.epizy.com/combat_pistol_training_near_me.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 5396 bytes
SHA-256: e8e3d76bf76bfa998667d1a462e9a6b3560203b8136611d4fabf6b68620d1403
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 11628 bytes
SHA-256: d0c34342e606a094db6c427ad1da7fd2448b5dfb386a357cc095e46c5660113b
font_02_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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