Malicious PDF — malware analysis report

Static analysis result for SHA-256 c397f471ee328c03…

MALICIOUS

PDF

70.2 KB Created: 2020-12-03 10:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43ead02ecc0640778d98c3788b2bb656 SHA-1: 15b897f3e4bc18436b282d1738059cdcced519a9 SHA-256: c397f471ee328c035219008bd58859b43eca24c98ac50e5a2a098081c96a154a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. One critical heuristic identified links to known malicious redirector infrastructure. ClamAV also detected the file as Pdf.Phishing.Trojan, indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=built+environment+industry+transformation+map In PDF document text
    • https://pezosoxebigaxox.weebly.com/uploads/1/3/4/3/134337327/b4698662c88f33b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5fb6c32f56c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_5fb75c2e674c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5f8e20023d97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fa8e4548e1f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f8f32324ddac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8ec312d051d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fc1879591ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5f97675369f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_5fa42264ae85d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5fc882282d76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f95f09c8ad57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_5fb855cf42bf3.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/beluxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/20394220503.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 5400 bytes
SHA-256: 436fc6a793fb3d3e15f3a29eef280af4f875670464f3945800ee3b37bd85363d
font_01_sfnt_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 9720 bytes
SHA-256: aed918ae4a283ded03761179d204d985180ad77e1e943e96bb10dff5e29f11ba

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