Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8b9811efcd5178…

MALICIOUS

PDF

67.6 KB Created: 2020-12-24 19:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a0a66d3db0048b502d07d36a1806043 SHA-1: 65c68f05285eaef21170c24e8d0ba8a6063b29e4 SHA-256: 6c8b9811efcd5178b054c67ae90fcb13fdc4210d1fa1a186aff639a90b83ea8a
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, likely used to deliver a secondary payload. The document body, though heavily obfuscated, suggests a lure related to a 'birthday invitation card template'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=birthday+invitation+card+template+pdf
    • https://cdn-cms.f-static.net/uploads/4451950/normal_5fb9356e290b6.pdf
    • https://cdn-cms.f-static.net/uploads/4486036/normal_5fd1ffb3af1c0.pdf
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f8c7b5ea107e.pdf
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fa416ad0d4f4.pdf
    • https://cdn-cms.f-static.net/uploads/4419003/normal_5fc33661108e6.pdf
    • https://static.s123-cdn-static.com/uploads/4371808/normal_5fdca54c16bae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejawiwomak/mild_cerebellar_tonsillar_ectopia_information.pdf
    • https://uploads.strikinglycdn.com/files/e7c7ee29-40ae-41d5-9514-8391ca16dce6/84482372892.pdf
    • https://s3.amazonaws.com/nazekisigiduz/lozetaraxudap.pdf
    • https://uploads.strikinglycdn.com/files/2698cd81-0334-4be0-b79c-7460244d071f/7533469142.pdf
    • https://s3.amazonaws.com/kovilowab/vufodigodotak.pdf
    • https://s3.amazonaws.com/geraromu/66963116925.pdf
    • https://uploads.strikinglycdn.com/files/9ddb5d69-e556-4e8c-812e-6f149c13a912/balobibavepeno.pdf
    • https://s3.amazonaws.com/juduk/nasavemiruzewaw.pdf
    • https://uploads.strikinglycdn.com/files/0f0d1e0b-5f1f-420b-aa1a-416fc6812a86/kmart_return_policy_2019.pdf
    • https://s3.amazonaws.com/bifamomove/bipakawulakolekemilujopaf.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_off0000cc00.bin
eeaf8bd56c41c32e16a3b95758dae217fe3863a52530d947d3597ec887a85c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 5428 bytes
font_01_sfnt_off0000de63.bin
1e9c67a10ce9ed546012845988c04c3a672b5c931a1cb46c49e6bfc9b64229c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10228 bytes

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