Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2e02c089b26add…

MALICIOUS

PDF

80.5 KB Created: 2021-05-22 19:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 171f71dececb1d2c7624c54125db6233 SHA-1: b923cfd6d7dd1550f21efceaa4aec3b42040f8b3 SHA-256: 8e2e02c089b26addda88661ab3e1932b23596ce67ffbae6df760331d65134258
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+remove+a+stannah+420+stairlift PDF link annotation
    • https://kaxuzemerufo.weebly.com/uploads/1/3/0/7/130775382/5161313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_604b8f4dbb240.pdfIn PDF document text
    • https://ridulimozujigo.weebly.com/uploads/1/3/4/1/134109280/ab15d1f957406ee.pdfIn PDF document text
    • https://megevoweroke.weebly.com/uploads/1/3/5/3/135351245/xanoxap.pdfIn PDF document text
    • https://pexagujunivati.weebly.com/uploads/1/3/4/6/134684520/vojeg.pdfIn PDF document text
    • https://razosopowob.weebly.com/uploads/1/3/4/5/134509902/096bdfdc0.pdfIn PDF document text
    • https://votumojelobi.weebly.com/uploads/1/3/4/8/134848055/8429403.pdfIn PDF document text
    • https://somigoduwus.weebly.com/uploads/1/3/4/4/134470899/lenet-sopevoxok-sisifosi-ropudakelega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_60653767974b2.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/6b00ea5e0a.pdfIn PDF document text
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/jesapafu-pixidorewomafit-nepigusuxefunex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6010d4634009f.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/nodibeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_601a254a898eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6010a6d33fb75.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/9426918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5ff917fd3566b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 5484 bytes
SHA-256: 584d4738df7db4ceec2bb2593bcec49553aef738efd1a2498328b030c10cf9bc
font_01_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 11048 bytes
SHA-256: 9577b0836ca76e9383a6cbd235d80c79d833c782b964f185188771c717d3b73e

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