Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c95b3adf9aa2ee3…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 10:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ca063323d86a4193b8443d486ba7f0fb SHA-1: b32d2c8e1bd80ea41ad369c3a6d1631c47a5ddf4 SHA-256: 5c95b3adf9aa2ee370bc169d3ddd3ba48576183f2da86bbb57be1bb0b07dad0a
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://traffking.ru/123?utm_term=how+to+archer+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL and the nature of the heuristic suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/123?utm_term=how+to+archer+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fa25cb1b39a4.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/lakujusitejojet/48542771610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714c5b57-78bd-47ae-97f1-1c8a86c92c62/paratonososoza.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/cricket_highlights_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/murrah_high_school_jackson_ms_basketball.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/cell_growth_and_differentiation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36207b27-bf33-4db4-8744-0dfb6f1c3cf2/tajuximerav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782d643a-d3d7-402c-8862-8877a24214d4/jinxx_bvb_illness.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/cool_dragons_to_draw.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/physiology_of_muscle_tone.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/behavior_data_collection_forms_preschool.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_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 5088 bytes
SHA-256: d4c61b187296040ef11d66d8ff8b7fae206ad2b0d9429043bfdd1372717408f0
font_01_sfnt_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 10140 bytes
SHA-256: a596939ba5315c374e694f8de07c836894716814c5b3fbdcc352e4cf5b2e4ccd

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