Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86ae64f76992013…

MALICIOUS

PDF

82.0 KB Created: 2020-11-26 09:31:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dc7d7f5c3318349744f5d3ac99e5a304 SHA-1: 203057ef883613629e733cc4effa648591375774 SHA-256: a86ae64f76992013d0e05fc6b0b858e4e38d4bae038970ebeb6bf670e827ea32
156 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 0.9997

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 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.
  • 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://traffking.ru/strik?utm_term=pse+fang+crossbow+bolt+size PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f895eb52b863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5fa61e4680ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fa40a6386c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_5fa91412200b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fad8fed5d80c.pdfIn PDF document text
    • https://jedujidiki.weebly.com/uploads/1/3/4/3/134352610/acc53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fb6146d57d1f.pdfIn PDF document text
    • https://wawaxotev.weebly.com/uploads/1/3/4/3/134368025/luwanuto-zixaruxitixa-tiwumisowuder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f92772548682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b4a201-da51-4f29-9b0e-a371dedaee09/pazimenekisofunudaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc03bf8-f876-44c6-b26c-3026598666db/93861379023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3149a0c5-3cdb-491f-ad5d-d413862ecfdf/track_and_field_event_score_sheets.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_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 5332 bytes
SHA-256: 90678b23d612b2052d63e026a4bdddb4375c7956904c8ac6c6c0d47a5a909edb
font_01_sfnt_off000117fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 10208 bytes
SHA-256: 90a315d69e187447a0112977828ea9124dc573eeec0d1ebd5e2788bf9e317899

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