Malicious PDF — malware analysis report

Static analysis result for SHA-256 5321c44c8cce1ff5…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 02:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b2ffb49fa0ac3ee6173a0c4fd928e3e SHA-1: 34b1720e697f478b7b57b9a5fca8f8d3272ed249 SHA-256: 5321c44c8cce1ff5c645c365259274c6536ff32263d02e1cacced0fa752fe7ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on luring users to download a Minecraft APK. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics suggest the document is part of a phishing or malware distribution scheme.

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://jacksth.ru/wix?keyword=minecraft+apk+free+download+latest+version+0.16.0 PDF link annotation
    • http://xevusezes.medianewsonline.com/canon_70d_manual_portugues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_603690f91e6cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_601bc7854e2ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_602527ff41ad3.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/kijogudimotolix.pdfIn PDF document text
    • http://waralolojogeta.sportsontheweb.net/68256540343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5fc72189b408c.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/romodew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468838/normal_5ff0baf5f056d.pdfIn PDF document text
    • http://pogakegi.22web.org/tinujafonafakogoberekeb.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/5268748562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/29007162024.pdfIn PDF document text
    • http://desovizipelo.onlinewebshop.net/american_heart_association_bls_test_answers_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/93294789521.pdfIn PDF document text
    • http://batapijas.myartsonline.com/mixevutavu.pdfIn PDF document text
    • http://gowefemum.epizy.com/84110010558.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_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 5748 bytes
SHA-256: 190d1c38fdf6a43c6908c6134e89124f24e7cdcd7a03ef4a0e46130dd588fe2c
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 11072 bytes
SHA-256: 82d0771ee06a202ec7e0b971956a9953e64468d02e91808f081980ff09b67951

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