Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3e1f4db238eebd…

MALICIOUS

PDF

67.9 KB Created: 2020-12-04 11:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1f041339a175844d8f0fc965a5841f09 SHA-1: 96ff91267a91f1dff42489fa1cf747e912951c3f SHA-256: 1a3e1f4db238eebdb47989573bb21870f0a8fa1039e3a02226e8aa70329a1366
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous links suggests an attempt to direct users to potentially harmful external 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=lesser+shadow+evocation+pathfinder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5fa16786005a5.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/9170521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_5fbf61fd8dd49.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/mijedusovineti/alpha_phi_alpha_rho_sigma_lambda.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/study_of_periodic_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2812b6ad-1fda-4368-b646-beddc93085c9/17004659604.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/my_oldboy_apk_download_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c8f503-1ae1-450a-9323-8169bf505c17/best_soaring_locations_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/zavewoj.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/fumimowadavosa.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/f_b_service_basics.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 5304 bytes
SHA-256: 6d4d0e6aa1f4741d822fcf5edbc0e77feb463bc22b85ea36014dede9915d4dc9
font_01_sfnt_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 11476 bytes
SHA-256: b25d09a4f991acb8e6fc841ed59dd042460f1fcf745355cd5792d318ceb35aa4

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