Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bdcd2f2a1a2104…

MALICIOUS

PDF

71.1 KB Created: 2020-11-09 18:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05ee74598ea1e83b40a4dc1e8d22ba0f SHA-1: 1df14d6dc2681b3a88c391d56f7c51d573837aa9 SHA-256: 87bdcd2f2a1a21044ae68adf005be70c6279776e588540a0dd881d948eba883b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a mass external PDF link farm. The embedded URLs suggest an attempt to redirect users to potentially harmful content or to engage in SEO spam. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics indicate a malicious intent to manipulate web traffic or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?keyword=den+movie+2001
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/voreni.pdf
    • https://jaxuwigoba.weebly.com/uploads/1/3/4/2/134266140/0af32b9c0.pdf
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f94814e02442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rimepusox/los_deportes_en_colombia.pdf
    • https://s3.amazonaws.com/tubupejevomo/spanish_ar_verb_conjugation_worksheets.pdf
    • https://s3.amazonaws.com/wexukufedepim/96181113761.pdf
    • https://uploads.strikinglycdn.com/files/e4bc8218-0e7f-4e0d-b184-54f556e93d19/kasutatow.pdf
    • https://uploads.strikinglycdn.com/files/1a8dc7fd-3c7f-45d5-aa91-9caf96a74254/designated_survivor_sasha_booker.pdf
    • https://uploads.strikinglycdn.com/files/34e726e2-e376-4a58-ba5a-19664208c30d/59752877854.pdf
    • https://s3.amazonaws.com/banula/vefunovopiveguxiselafejum.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cb.bin
07df998e6209d78625332a20ccfdcc444cd0d52c9ab2b9f5970de4fa0e29f049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 4700 bytes
font_01_sfnt_off0000e8cc.bin
e642633314d86220a4d95e13f5cf592dee9101ef60009f7cc1244b2bba46abe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 11656 bytes

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