Malicious PDF — malware analysis report

Static analysis result for SHA-256 8270104c00c166e5…

MALICIOUS

PDF

76.9 KB Created: 2021-01-04 01:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4630cc12e57bc2733472876a6975b899 SHA-1: 76affae04e9e32410c138f21bd43fadf72fc938d SHA-256: 8270104c00c166e543df5179d5dfabfdd6f4bc5b94561539869e9f5b92947f78
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is a phishing or trojan delivery mechanism. It contains numerous links to external PDF files, suggesting a link farm or redirection strategy to obscure the ultimate malicious destination. The presence of a link to a known malicious redirector infrastructure further supports this. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://traffmen.ru/123?utm_term=the+elephant+man+play+pdf In PDF document text
    • https://cdn.sqhk.co/ninivaxibab/dTigMNH/gafozafubakefegafufonolis.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/dDzjagb/71632477026.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/lefokoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373992/normal_5ff22feccaa52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f89328363322.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/sgjjbby/68735778184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fdbdb547aef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fd68f991ca46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fadb8991db5e.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/ijFjaBV/16000706680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fd36b9361d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fe68e9c3ca72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f875629cb4b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fe0fb3fc4ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5fb7e06f4b5f0.pdfIn PDF document text
    • https://mugozesomufigor.weebly.com/uploads/1/3/4/6/134608113/5970001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 4688 bytes
SHA-256: 4696aded31c405c6fe31d2ae0d805a93eaa77ae0f1471a6364c1f216cbe73307
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 10976 bytes
SHA-256: 689db946dc182dd4728fdc7e9641fbba0f39b270aa9ee8f43b79fd78f2449b61
font_02_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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