Malicious PDF — malware analysis report

Static analysis result for SHA-256 159ac07dc476cbf2…

MALICIOUS

PDF

77.8 KB Created: 2021-04-22 18:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5ad555ac9be5982caf8553d908bd4ece SHA-1: fc59239d9a3d95cd838f9e6071a4ec0132da6194 SHA-256: 159ac07dc476cbf2bf36e1c30ec6f2ec8fb202acbab1b5e81d0677808768e787
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'pelibifir.ru/strik' and a query parameter suggesting a lure related to resetting a Garmin GPS. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=how+to+reset+garmin+gps+78sc PDF link annotation
    • https://cdn.sqhk.co/kamozipu/ciiBijT/mabavutovigobifitixar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370267/normal_5fe0ee02ceb6b.pdfIn PDF document text
    • http://minuette.me/free_editor_to_word_converterv5n1z.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/iecH7JM/95264607188.pdfIn PDF document text
    • http://ig-about.net/nextbook_flexx_10_price9ch8w.pdfIn PDF document text
    • https://cdn.sqhk.co/dubeminap/yhcgejd/binalizedodi.pdfIn PDF document text
    • http://snatural.space/any_sandwich_shops_open_near_mexocis.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/5QAqghu/sapovatagopizoz.pdfIn PDF document text
    • http://masajsalonunuz.com/50854035228f0cly.pdfIn PDF document text
    • http://rupitori.66ghz.com/vezozopiwezavanufavimiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_605bb9e676c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6009efec142c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_601286a69efef.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/Yhgiaa1/battles_european_theatre_world_war_ii.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mejoxuxo.rf.gd/biology_investigatory_project.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_a8b43cc54fb140d0ab1f42b3b864378b.pdf?index=trueIn PDF document text
    • http://vetozidute.rf.gd/83196544453.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_ae580b29f962419aa60e634911ef6370.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_5d05035fdac045e9b4a368ee7da80675.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_068a386ed60c41f99bc870d8ef7b2aea.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_7dbf5ba12d354df3831bf94467e1d72e.pdf?index=trueIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_ef663b09e76d4fb28e1c34cb768f58da.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_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 5548 bytes
SHA-256: 0277f1036842153c5a8f844ecd05ebf5c3599b9732f0b927757ebc0b37773596
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 11336 bytes
SHA-256: 51418137d90108dc0ae24392ddb039b8df08cd9004313e072de0885964c7726d

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