Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f92e59753e1641…

MALICIOUS

PDF

74.2 KB Created: 2021-03-29 04:39:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35aa9c46b681322f9c68e8d20ce88746 SHA-1: 763e323396623b39aecd23ac2b0d3912f0be79ff SHA-256: c9f92e59753e1641243cc2d281d76b256ae3267c19b51384b55027d910246e42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=annabel+lee+poema+espa%25C3%25B1ol+pdf
    • http://sowakowakemim.mygamesonline.org/brush_up_your_english.pdf
    • http://gifagudilul.mypressonline.com/fawupiwilusuwatekiw.pdf
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/zugetakuxujera.pdf
    • https://kovekigesig.weebly.com/uploads/1/3/1/1/131164481/18d397855519.pdf
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6027424fa0d34.pdf
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fef83acbde2a.pdf
    • https://static.s123-cdn-static.com/uploads/4445340/normal_5fe0eeaeafd70.pdf
    • https://zowozenuzaf.weebly.com/uploads/1/3/1/8/131857278/joturuzij.pdf
    • http://jinevul.mygamesonline.org/68084778839.pdf
    • http://rusakadovub.sportsontheweb.net/daniel_j_boorstin_los_creadores.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/143ccf24-9207-4bb9-abb1-1f7bc1be0046/burris_eliminator_4_scope_review.pdf
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_eb0ab88b7c164b768c7ad92c071a9766.pdf?index=true
    • http://kadoxosin.atwebpages.com/inteligencia_emocional_se_puede_ensear_en_las_escuelas.pdf
    • http://pizitibasowu.atwebpages.com/alloy_steel_properties_and_uses.pdf
    • https://uploads.strikinglycdn.com/files/6f0f302a-d60b-469a-8649-a7f8f1bb37f7/how_to_score_gre_verbal_reasoning.pdf
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_e4424a317f9b46fdb68e11fd16d72b7e.pdf?index=true
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_60cca9fade534987aa7675a16c2b2ae0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff2.bin
a6ed4cd4c6087ba7f44559ba97c3eb24e9efb55f4e07e6a12b69cf35ebcf0a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 5432 bytes
font_01_sfnt_off0000f215.bin
34e6ae2cd3683bdae76bbf5d50bf2d3ea5c8462cae7c45efd664a991da4d3f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 12244 bytes

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