Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c96ca2ecb312a6…

MALICIOUS

PDF

67.0 KB Created: 2020-12-17 22:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 93909c53ecbfd81d44d6e53f9cad21bf SHA-1: 311ec5545bd7749a3790dc46eba5e99b04f58108 SHA-256: 35c96ca2ecb312a6b06152002deaa298c8e87c86459793717994624c54d6fbe1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI pointing to a suspicious domain, likely intended to harvest credentials. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' suggests the document is part of a larger campaign to generate traffic to malicious sites.

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=citadel+document+solutions+login PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fbdd67f4cf47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5fc177015b865.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5fccf08a6f30b.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/0ba9546cdfda.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/9e6afc8db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5f9824f5ddb42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5f9e5238a3ac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5faffd8285913.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
    • https://static1.squarespace.com/static/5fc5b8d3ec917750a3f8a333/t/5fc67cc0fa04221c710098a8/1606843584894/12945799402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d31200-e315-4d59-9827-0182df77e8df/student_friendly_quantum_field_theory_basic_principles_and_quantum_electrodynamics.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd03ea68bfc5186168d7b3/1606222826647/56559482417.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/rijusidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0b81ee-2397-4753-9e7f-42c9461da103/divewaruwukodonavuzixek.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_off0000ba1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1B 5068 bytes
SHA-256: 1e6ca487772c77bb369579982fc6d883cd4b51ba8b61b365bec3dafd8bc40add
font_01_sfnt_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 11172 bytes
SHA-256: 29778143d92ef647220151bf29c604a9c1f9b7710e82cede9d386024234d47e2
font_02_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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