Malicious PDF — malware analysis report

Static analysis result for SHA-256 7508e5d3caf2b731…

MALICIOUS

PDF

73.4 KB Created: 2020-12-16 23:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 912119cc67fb20025704a2ac785b8fca SHA-1: 3b68b1737fd78ad1da1b304e2afff586dda03311 SHA-256: 7508e5d3caf2b7317049b59b086d49f8f02e8f18150abb93569c088b7013f48b
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. ClamAV detection and ML classification further indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs points towards a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=abbreviation+for+master+sergeant+police PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488130/normal_5fd61ad9d432f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5f9b476fde005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_5f97638e9eed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_5f9b39e3b4109.pdfIn PDF document text
    • https://gizewafimeferem.weebly.com/uploads/1/3/4/5/134578419/f165d44603ebf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f9532bcdfdf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5fc9eb5b91a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5f963ad70dc66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5fb4f266a4f13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5fb6c9f03b6e3.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/gurowozenupifi/capybara_cheat_sheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79dedd743eb43444a3c30/t/5fc991413ff94c207e01eb29/1607045441869/easy_payday_loans_online_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/88442446290.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 2856 bytes
SHA-256: 6a7390c9e634f7f167841a75ffa617ce3f7010ba402b4c06ad0a47e5500b6a59
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 5524 bytes
SHA-256: 2250a328c98f522b8652df649199adb227ea7f85222d1e01af8138b76d67a80a
font_02_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 11636 bytes
SHA-256: 3fedf10936ad1863acd5a6bcbd316629fb0150a0bd3d719a43c2222471556aae

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