Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad33800bb9380f5…

MALICIOUS

PDF

127.2 KB Created: 2020-12-10 09:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fe33b9cc813a31540bbdf658c4ac151a SHA-1: e70e3650a89bd9fe657e15dde6e03a8419bbe2ee SHA-256: 9ad33800bb9380f50d37b15902cbb40d983da685e5497e314c812518f6540483
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector and a large number of external PDF links, indicating a potential phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://traffking.ru/aws?utm_term=fallout+76+tadpole+exam+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f9a046538d97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446651/normal_5fc4236e8dc14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f9d4d3966b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5f9705a77398c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_5fab0b09656be.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/lanotevixuxi-romitamawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc585fe27a199023ad4b484/t/5fc922fbf543ef1b51061cd6/1607017212759/93645553165.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc522e660f2895dc10348e3/t/5fcc776b9aa2de0c648c0ac7/1607235435327/jakuvesezop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea519a9-fbe2-43b9-9050-ae0861462d6e/recommendation_letter_template_master.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/73680243709.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/68854117353.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe09d83c02f22b9dd46b73/1606289880717/62719875185.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/97185106872.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6695bbda9c57a97e3e323/t/5fcf195869d6d06d55393f4b/1607407961280/kuvewatoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51880994-54bb-4376-be86-b9706dc055f3/50634185388.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f8f692c50b1a1e77efcd/t/5fc142e43485235c86f5253c/1606501093379/87165645103.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_off0001b6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6DD 5452 bytes
SHA-256: 4995b7835fe907745b0c5770a260122f891f2bbeca79782d4ac5591df1a2f9cb
font_01_sfnt_off0001c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C96F 11196 bytes
SHA-256: 8d290eb1f37f77ef663209ba0655abd34cfefad1a1b8de97f18336a877a77456

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