Malicious PDF — malware analysis report

Static analysis result for SHA-256 4229b1116973a7e8…

MALICIOUS

PDF

76.0 KB Created: 2021-05-26 05:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fc29ff8f337ba2fb96ce44fe7f58036d SHA-1: 4852d0d8430fe80d970d756cfc3d7a7014858919 SHA-256: 4229b1116973a7e8ee031618ca9860c1dd016441ce4bd64c61e6ddeea4dc65db
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The primary malicious URL identified is https://dugedepap.ru/strik, which likely serves as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/strik?utm_term=what+does+cis+deduction+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404524/normal_604824806bb25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_5fe7a740a39a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_6066eb4ce4890.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/detonawuzotadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_606066aa89360.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/6768067.pdfIn PDF document text
    • https://valazasabo.weebly.com/uploads/1/3/1/3/131398294/693b80479a.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/godewumazek/cortisone_shot_in_knee_for_meniscus_tear.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/63872207619.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/julius_caesar_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/how_to_clean_whirlpool_duet_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/11806404221.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/invisible_influence_kevin_hogan.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/cisco_ccna_1_chapter_2_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/sketchup_free_downloadable_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/36229429862.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_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 5064 bytes
SHA-256: 613fccf2fe9c6b9f48229cd7bd7ad6f25ff7d91adf8538e276a65c4fda2d7501
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 11352 bytes
SHA-256: 2110700291a542ea04fa24e743d7d8adccd2def107b0da54096f8589a57adc1f

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