Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71a2679f9118622…

MALICIOUS

PDF

68.4 KB Created: 2020-11-26 02:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e88cfe06bc6df9d967abb0bd8427b522 SHA-1: 9f438edb1fa920bb9de9b60e978bc833984e0e1a SHA-256: c71a2679f9118622f7e9d79b4569b66ca838f246655dc65b30bf3591887dbfbc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafficel.ru/strik?utm_term=best+shifter+feats+pathfinder PDF link annotation
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/sasimawigerobimuk.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/renasevap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f8d17699154b.pdfIn PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/9084182.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/fasanag/architecture_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518ca05a-c92c-4f9e-800a-d5fcc2e43492/the_wolf_of_wall_street_free_full_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/mamekasiwiwukab.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/microcytic_anemia.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/windows_10_port_135_listening.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/d_d_sorcerer_guide_3._5.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/ielts_reading_sample_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/53558055978.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_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 5144 bytes
SHA-256: 19383d0bb8e2a40d46e75215825ae857f9ae5b7d531c0989951cb6dd97012542
font_01_sfnt_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 10508 bytes
SHA-256: 41e610cda76bdac6bc2ecdad98464f7e9b72dd1be0737105f589435b9ba7cc79