Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dee162d5411bfa1…

MALICIOUS

PDF

74.9 KB Created: 2020-12-20 08:34:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0853a5a384a77670ede671f4096864d5 SHA-1: 5709f183477d48d7a6288db7fc83182a65bff1a3 SHA-256: 9dee162d5411bfa1a727c46dac2d48c40eb1988da05f196df3e670b274a67e52
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary malicious URL being https://trafftec.ru/strik. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is weaponized to redirect users to potentially harmful content.

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://trafftec.ru/strik?utm_term=journey+talking+stick+arena PDF link annotation
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/939538.pdfIn PDF document text
    • https://zubajabazu.weebly.com/uploads/1/3/4/4/134466761/3790178.pdfIn PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/8841043.pdfIn PDF document text
    • https://tumovapexawezan.weebly.com/uploads/1/3/1/3/131398362/6fb953.pdfIn PDF document text
    • https://murusezikarif.weebly.com/uploads/1/3/4/4/134436274/3698462.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/gurafoga/50863196440.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/familia_sarcophagidae.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/complaint_letter_to_hr_about_manager_templates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5cb0c12facd59cece9961/t/5fce64402fa8bc6bcd1d8e99/1607361600978/top_50_nursery_rhymes_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcabee0a190b16b315d1db/t/5fdd1396745a44618d1841d3/1608323991166/36557644239.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51ca1bd14ff0dd2b7ddca/t/5fd758b95b1f6f7539f3fd84/1607948473568/76299641609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ec362b-e9b7-4e64-a1cc-fa4716c8d162/delta_sigma_theta_epsilon_iota_chapter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdff4c145a8629dc76f837/1606287181374/tomonanagurelaxorirex.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/keto_diet_for_weight_loss.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54070c14dfd36fe0e2b11/t/5fd029f448ae4d1218f7c8ff/1607477749539/64888839733.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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 5124 bytes
SHA-256: 935ab16e69f97a8e6420a4855be2b139e53f8aaab28a271e29e20b4ffcd8a9c2
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 10896 bytes
SHA-256: 86212a2d310da21e7789b1a8acf0b56bbc6c47a27ffd4e16b10b95371f954386

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