Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3bdc1686659486…

MALICIOUS

PDF

76.2 KB Created: 2021-04-29 18:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e1cbc7a5d2d2f086f272fb47f27f6963 SHA-1: acc72cec40064c990d1d37c45439b159c25d445e SHA-256: ae3bdc1686659486c46b723c2f3bdc5ffffc47ba12870d91b532b47bfe1eec33
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure itself facilitates redirection to external sites like https://druttle.ru/strik?utm_term=good+games+for+8+year+olds+on+ipad, which is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=good+games+for+8+year+olds+on+ipad PDF link annotation
    • https://cdn.sqhk.co/nuroteditu/ihFzhak/21376529725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_6062ce2e094aa.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/tizufebibifiwamejejuruxod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_600496bc0656f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fe7cce381ec6.pdfIn PDF document text
    • http://misstourist.info/vivedapukpm1.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/ghgehac/mulisezigekojexopakureni.pdfIn PDF document text
    • http://alphabitx.com/tesol_journal_author_guidelinesdyehb.pdfIn PDF document text
    • http://1eyvgo.xyz/siwixusizojotib078f.pdfIn PDF document text
    • http://srakan.space/jakojomumuterubaloxemoxtzjw2.pdfIn PDF document text
    • http://idem-peshkom.ru/nuzajekeluboduzzg32j.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/ijhiaT4/18690738488.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/fibZhio/12106878368.pdfIn PDF document text
    • http://wokodanib.getenjoyment.net/ati_active_learning_template_medication.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465262/normal_60039e73716c9.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/lakadutof/betfair_poker_android_app.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/pozegararedisesiti.pdfIn PDF document text
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_c4be9e9e09fb4cad8addabf1c45bf446.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/jamia_millia_islamia_anti_ragging_affidavit.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_b931d88f49394cf0a618dd192f0efe94.pdf?index=trueIn 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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 5688 bytes
SHA-256: af47d83580a4ccfe651bc071031be3402784c8a13cefe0d08e3bf10269766fe8
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10796 bytes
SHA-256: aeea6a2803a8f1ba028fabafd407497cc46cbe8c47c896f25df0012e4b706364

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