Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9e5033b919069d…

MALICIOUS

PDF

67.1 KB Created: 2020-11-14 18:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a53d926107733f90f2d74bb6c731c717 SHA-1: 118cabf3b374c46c762c93369a144ff2a492875c SHA-256: 1e9e5033b919069d47d274a51499b3cc571cb11faf6c64993e77cce8ab919ef1
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another heuristic indicates a large number of external PDF links, suggesting a link farm. The ClamAV detection and ML classifier further support its malicious nature, classifying it as phishing/trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=dell+xps+best+buy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f90831711d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f933bf16df6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_5fa9bdd263850.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/kifusadoj-suwolujixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8e713d2aed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f89fad619c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f86fb73d4862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fa8dded39f8d.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/lazolen.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/686e2102-c38b-4929-bec0-31a294a90b62/laxudotelurawomewajaxajim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723a9d8f-665b-407c-a987-373375c9afba/nefibezupisimesopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15cb7870-86a0-4da4-9c1f-75493eddf0c2/16589054789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c62c0a-7832-445b-88e0-85f287e7d6aa/76015415215.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/from_pride_to_humility_stuart_scott.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f259d12-d039-458f-baf9-99d42d4a520a/97457216311.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_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 4816 bytes
SHA-256: 259b6ea0e5b71ef059d3d666f34a823891098fd5212b3c335dc152c5dc5ff0aa
font_01_sfnt_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 11608 bytes
SHA-256: d94a0ed26ca90b015751f92ca1608bbc4bf773edc19ffb74abafbeb52d8b9542

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