Malicious PDF — malware analysis report

Static analysis result for SHA-256 2137981b63dbd5a1…

MALICIOUS

PDF

72.0 KB Created: 2020-11-18 05:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 53423a8953ccb542cd7f61842faa6891 SHA-1: d088371ab0172a48836b41fb27bbd69d8146be5e SHA-256: 2137981b63dbd5a18f4ce44c32bb71bc5644255ff0931931ff4b0d00b815fdb5
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://trafffi.ru/123?utm_term=perfectly+competitive+market+graph+surplus', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of the external URI and the ClamAV detection strongly suggest a malicious purpose, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=perfectly+competitive+market+graph+surplus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501993/normal_5fb483e3ea5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5fa99f1075712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f91bdc0a09a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f919e9ac7837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_5fb4175295f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_5fac53f891953.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/4be2211e-7727-4b49-915b-dd9922070940/tekemu.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/history_of_lactic_acid_bacteria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee76f1f-a547-4acd-917e-2143eb5f7f3a/73479163036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c8fa5e-f346-4dd2-a2ea-7e9ac5e6146c/tolitavegawunofowazasiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf0b3ba-0ace-4e0d-ae53-26dbf81d5433/90867381729.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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 5656 bytes
SHA-256: 9f295802c63e3f9f421c0fdad65dc7c85ba11ab254b44cd13c551f6f64a2a8b8
font_01_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 12228 bytes
SHA-256: fe79cce8da2350bdb8072f8f92e49f96f902ca320f0b9ccae75a309ebf39430f