Malicious PDF — malware analysis report

Static analysis result for SHA-256 78aeb3f76228c5fc…

MALICIOUS

PDF

71.3 KB Created: 2020-11-10 13:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e5b5dbc2a8eec8dc07c8b1c093a4a999 SHA-1: 0fce3b5ed4fc43c1a5d2cb5b50d1956ec3417e9e SHA-256: 78aeb3f76228c5fc038df73b36c107b1e9ab120768490a5ed3e04d04587bd3de
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed for SEO manipulation. The embedded URLs and the ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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?keyword=leander+isd+school+calendar+2020+2021 PDF link annotation
    • https://mukokoloraji.weebly.com/uploads/1/3/4/1/134131612/kabolafupaxomuv-kupogunofid-kuboroxufuwam.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/vilagonapik-muvoveworoj.pdfIn PDF document text
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/ludeluxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1280a598-5d30-4b55-8479-71ba0a79a80e/manual_de_emergencias_toxicologicas_digemid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e29f39-5d0b-4e02-901a-c131c6f9df22/unblock_run_3_unblock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c03089-03ba-44ff-ad8f-95b4529d01b8/ribapijuwizekasotosujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0b081e-b8ec-46ca-8f8b-006c782ee1a2/swtor_6.0_gcd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f25dab8-b527-4602-a10a-8dcae7838d37/dujapumiwifuxupu.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/kezaketiwixedadevibawav.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f635.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF635 17604 bytes
SHA-256: 8f4971500f8d5914a1b8eec8608194e713c6ad3153ac78fa18587287691f0b56
font_00_sfnt_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 5296 bytes
SHA-256: 16fd4c2eb26ce128ab700472097bfb4ad609a45af1d365460b8859a6f6d7ff08
font_01_sfnt_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 10140 bytes
SHA-256: 5e806e5293a398c32d09365fe79cdfce7861fb7cfa73f14c3fb80fea8686b27b

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