Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b1a7e25a47fa7f…

MALICIOUS

PDF

84.7 KB Created: 2021-01-17 08:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 070c6ef8cb74b240d34a668afd2bec7d SHA-1: ef95f156be812f9229cd5110f0519bc004bb6d5b SHA-256: 51b1a7e25a47fa7facf29eef7c76a69c659e41d2255cd19cd037c587f8664339
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to redirect users to phishing sites or malware downloads. No scripts were extracted, but the presence of numerous external URIs points to a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/123?utm_term=hamms+beer+sign+value PDF link annotation
    • https://site-1174761.mozfiles.com/files/1174761/71353566285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_60038447de486.pdfIn PDF document text
    • https://site-1172267.mozfiles.com/files/1172267/39154620167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501993/normal_5fb95de3155ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5ff573638a88d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fe2081d8a0d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fba3c29579d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_5fc19d34ce090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f8d1f517c853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f99dbe176e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5fd92ebc75b25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5fe00f73bf616.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/sawagirukesux.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jFMgiaZ/96962227495.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_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 4856 bytes
SHA-256: 039317a2d09cac2ab40aae56f85e5a6c88188ba0d216dc31d7b0aac954ddf877
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 14940 bytes
SHA-256: 40dee775cdf0f0681109b78ac09f424b7b9ae893b9b8506c2e08b928ab0af5e3
font_02_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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