Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca377c80f033d463…

MALICIOUS

PDF

77.8 KB Created: 2021-06-28 20:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c5f2cd37d99222cdaeb32380843be65 SHA-1: f919a0792f63d1bcb910b2839580cbbb0ae807ee SHA-256: ca377c80f033d4635c01b656316d173eeea121f7a51cbe974da5cee7bdbf0957
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be related to search engine optimization keywords, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/wb?keyword=lg%20front%20loader%20washer%20error%20code%20oe
    • https://cdn-cms.f-static.net/uploads/4479673/normal_60231ae64c9a5.pdf
    • https://daxuwapeva.weebly.com/uploads/1/3/5/9/135969289/2326227.pdf
    • https://cdn-cms.f-static.net/uploads/4450514/normal_604d1d8af2276.pdf
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/0111ab79f9cc51.pdf
    • https://wumasokur.weebly.com/uploads/1/3/1/3/131384536/renurosumofev.pdf
    • https://povelelowu.weebly.com/uploads/1/3/4/3/134331265/zubigo-xovisita.pdf
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fc62e206dde6.pdf
    • https://xedenuxukufokar.weebly.com/uploads/1/3/4/5/134522900/30abdc0.pdf
    • https://static.s123-cdn-static-d.com/uploads/4370302/normal_60b295a2cd0de.pdf
    • https://judupivaruva.weebly.com/uploads/1/3/0/7/130775992/releseja.pdf
    • https://static.s123-cdn-static-d.com/uploads/4444378/normal_60b410a0140b4.pdf
    • https://static.s123-cdn-static.com/uploads/4494429/normal_5febb821654b9.pdf
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60444d058bf5a.pdf
    • https://static.s123-cdn-static.com/uploads/4451220/normal_5ffbd06e56ae4.pdf
    • https://cdn-cms.f-static.net/uploads/4370307/normal_6027ac9425685.pdf
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5fd974f5e9a20.pdf
    • https://cdn-cms.f-static.net/uploads/4474205/normal_5fd26422b9d91.pdf
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/2233116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0781da18-62db-47be-8453-52cc65ba363a/bepomefuximusemurakikejag.pdf
    • https://uploads.strikinglycdn.com/files/4a1f59d0-dd60-4677-95a6-3cbce980e0bd/89878660250.pdf
    • https://uploads.strikinglycdn.com/files/dc154631-1eed-4d03-afdc-5ba16886ccfe/zenith_transoceanic_royal_7000_manual.pdf
    • https://uploads.strikinglycdn.com/files/1c300cf0-aac1-4fd7-8a3c-a588719bc6c8/how_to_dye_yarn_multiple_colors.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_off0000f266.bin
23147c84aa98ad35e0f1e4dc1ab47295ed6588c0297856a1aafd3eed1e6911b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 5316 bytes
font_01_sfnt_off00010492.bin
ffbefa38358c8e8a6aa017bb9fb12b71ddbc3656b0dce5e74e504e5552538022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10436 bytes

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