Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c09188248e85799…

MALICIOUS

PDF

75.6 KB Created: 2021-03-02 14:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0ff90227e9e5780d8e2e5d9fa76bfcac SHA-1: defd7a0a7ad442f42047d3034da4a4cc57ecbd77 SHA-256: 4c09188248e85799e72fffa088da7505989fa645a404649f0e3ddf008100bd53
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://baarspo.ru/award?keyword=speed+queen+gas+clothes+dryer+reviews PDF link annotation
    • http://wodedutipif.medianewsonline.com/39447638422.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/lejesaxirivera.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/ee60d97c9c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_60027c23224ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_602f976bc9100.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/garikone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_601286fa2501f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_60326d1c3cfd0.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/what_is_the_main_idea_of_rumpelstiltskin.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/9013123.pdfIn PDF document text
    • https://fogiboxumejak.weebly.com/uploads/1/3/4/5/134518377/xizoxat_vefepubafaza_nodaserof_papuvufodo.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/gifanivotufavobak.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/philips_system_one_cpap_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_60387a094d93d.pdfIn PDF document text
    • https://jagobedumaniso.weebly.com/uploads/1/3/0/8/130873939/zajefosi-vawef-jufulixekemazut.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/ponivotigegepub/dimensional_analysis_practice_worksheet_2_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/bunapas.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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 5816 bytes
SHA-256: 7ffc4bfa71fea9b8a9261434e702eb339057fbd89b851ca609f97320f7e1989d
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10392 bytes
SHA-256: 1a254f9bf9773f52b5e6811a8f6a98bc8d27160cf5d2af7605a8532e9fb7def5

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