Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b911f70988338d…

MALICIOUS

PDF

77.7 KB Created: 2021-04-23 23:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e92f48f3d5c8ccbdf0f5b477774b7f7 SHA-1: 208ea4956272350a0ff5d71fa3dc465a4d06464d SHA-256: c3b911f70988338d084b6dc7565cb4c34e818c82b70ada45835f417a9f31a25d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it is likely a phishing or SEO spam lure. It contains a large number of external links, many pointing to disposable hosting, suggesting an attempt to drive traffic to potentially malicious sites. The embedded URLs and the document's structure strongly suggest an attack pattern focused on redirecting users to external content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/strik?utm_term=1997+polaris+scrambler+400+owners+manual PDF link annotation
    • https://cdn.sqhk.co/puvubuzu/gDJjeeC/water_slide_repair_game_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/f4Jicje/85354430688.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/dhjhjVV/stack_ball_game_online.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/patient_medical_report.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/f3ca939f6a3.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/qjbgdhd/gaming_wallpapers_for_phone.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/reverse_phase_liquid_chromatography.pdfIn PDF document text
    • https://cdn.sqhk.co/lakanodip/Eijeixm/game_of_thrones_stark_family_deaths.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/buwabalisuzavik.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/meaning_of_value_chain_analysis.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/nenoxutanekeri.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/vobudanajokepazuza.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/pukosof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_3bbb19fe2ff4424b9ac8978c5541a948.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/rudisogetid.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/xewapuduxenujevowakipetok.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_544428bbcfb94844bdb4bfa8da799cfe.pdf?index=trueIn PDF document text
    • http://fojosotum.myartsonline.com/misojugenavozazufekivu.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_4f5bc3f192334f9cb47362168fddd43e.pdf?index=trueIn PDF document text
    • http://zevesijuduma.atwebpages.com/podurarenar.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/case_study_guidelines.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/atrioventricular_septal_defect_classification.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_8be508995f5e4822a6744edfdf808bdc.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5732 bytes
SHA-256: 7f86f9b2c0109538bdf846c664d6184f5ab536450e1a29b016a174fe6373564e
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10636 bytes
SHA-256: 7f7004454ed2c9525005f14c8f3533aa637590196df8c7e69f36b4dac93c3032