Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b0ff015f819b9c…

MALICIOUS

PDF

72.5 KB Created: 2021-01-18 18:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 45f41b60c40fb832559f0c557f04a37c SHA-1: 9f5cec5e94dfac472e17fe6c2379287decd488bc SHA-256: 63b0ff015f819b9c2e5999e527056750f4b1e6a13c810c576aee8aea3c01b437
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure indicate a phishing or malicious redirection attempt.

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://bologen.ru/123?utm_term=men+are+like+waffles PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383928/normal_5ff0361a331a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fdb6f6b3350b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5ff2bfbb9989e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f951758b131d.pdfIn PDF document text
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/potivux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fe0869f7fd8a.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/licTmhg/43844395942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468253/normal_5feba094efcde.pdfIn PDF document text
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/e32893f0c777.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/3ZBmbsk/prank_caller_pulp_fiction.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/vjighkb/21866507749.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/pewebopufupe/gebotige.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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 4920 bytes
SHA-256: cbfca6acda1ffb95a15488b7e5bcfe43430040adc4fdd8947c935adee5ed1852
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 10776 bytes
SHA-256: e678029fb259d5f58f29ab97b694b55023bdaf8c8a1fb3f59e534388e045047b