Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b81dfcc2646625…

MALICIOUS

PDF

80.5 KB Created: 2020-12-16 00:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90c943827a7b8c31fc63b147fcf574c9 SHA-1: 5b54f646021662227989312b41641dde6c174c42 SHA-256: 63b81dfcc2646625b4cbb0994a28073a0d5bd578e740098284eca0fc9cefe93f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=rhetorical+analysis+essay+example+movie
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/e15aa479c4.pdf
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/dikizupunebupusogovo.pdf
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/7929232.pdf
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/lowesomi.pdf
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fc1e61c40139.pdf
    • https://cdn-cms.f-static.net/uploads/4409095/normal_5f9379afb96f3.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f8c5a936eefb.pdf
    • https://zanomegujinax.weebly.com/uploads/1/3/4/8/134873542/aba4a33.pdf
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/0fef735ed3b240.pdf
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/sezusogixugujolurog.pdf
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8d60283192f.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/6f10e71e115c41f.pdf
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5fa39fc84fb2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd069739-bb45-4354-b9d5-18cfafe3ee85/32587927364.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe25.bin
a0902a603a02526cbc007485dd1d0e8064446e3471745e044c524795dbfd8d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 5408 bytes
font_01_sfnt_off00011071.bin
65b74c7edc1d68cfac2fb6315afdc602d35b51bb162dda9ae92bee0df3cfdae7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 10828 bytes