Malicious PDF — malware analysis report

Static analysis result for SHA-256 005bf836181e5c39…

MALICIOUS

PDF

75.5 KB Created: 2021-01-29 10:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 68c5f1abebb3be91d61515a35cbab929 SHA-1: 22955ac4eb32253ff4f41b0d9c95a6970a0d8aa1 SHA-256: 005bf836181e5c39767bb46a7603450d1e9b94ce7ca19e4cce2f2de040390c2f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, particularly 'https://jottigo.ru/123?utm_term=generation+google+scholarship+winners+2020', suggest a phishing or scam attempt disguised as a scholarship opportunity. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=generation+google+scholarship+winners+2020 PDF link annotation
    • http://kudretbozaci.com/machine_learning_mastery_deep_learningc5w4p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5fe8918b21869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_6009d39457c10.pdfIn PDF document text
    • http://nigufuf.iblogger.org/41391872889.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/ifijYAP/bluff_synonyms_3_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_600fbcd8a3fa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_6007ed3fb7343.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/gizifodunoneno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_5fcd505165bd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxozuzupa.rf.gd/zidapobabujamesozid.pdfIn PDF document text
    • http://legofovivaxom.epizy.com/venusogi.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/pomerutipibe.pdfIn PDF document text
    • http://fobukisa.rf.gd/cyanogenmod_6._1_rom.pdfIn PDF document text
    • http://zasegusof.epizy.com/91557897984.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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5592 bytes
SHA-256: 1138172913ebc6175994d2498ad14c3d7c2936aecea32a7d8e5967f7b13c8ea4
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 10624 bytes
SHA-256: 736c3df45a1333ba031871ab39a68ca1a2a637b665a43970cf8497c170335de4

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