Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d2bcdc67e04acf…

MALICIOUS

PDF

75.4 KB Created: 2021-05-23 01:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a9e89e42ef6d31fe2217a5a0df4af4c SHA-1: 27f4dbfcc81b17e5c72036231c67d066ebd1414b SHA-256: 46d2bcdc67e04acfab0c9489e743e1b11168fc6595308cb090a8fe153b4f816e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to Weebly and Strikingly hosted PDFs, suggesting a link farm or SEO abuse tactic. The primary URL, https://pelibifir.ru/strik, likely serves as a landing page for malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=turn+off+private+mode+in+linkedin
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/lemuzelolewik_pamusodepamudo_nanopixewak_dugokunepig.pdf
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/63064dd84.pdf
    • https://static.s123-cdn-static.com/uploads/4420911/normal_5fc9ce1ec9203.pdf
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/vitoxasiwek.pdf
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/fubavixizidifuwuf.pdf
    • https://cdn-cms.f-static.net/uploads/4453537/normal_5fd9a28fdb5c6.pdf
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/c1c82797.pdf
    • https://tasufevijusenix.weebly.com/uploads/1/3/0/8/130814010/9636930.pdf
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/7923888.pdf
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fff773e980d9.pdf
    • https://static.s123-cdn-static.com/uploads/4379035/normal_60085e3e920b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ac6aaf99-21e6-4687-9840-baf4b8b90db4/77865663865.pdf
    • https://uploads.strikinglycdn.com/files/aea19355-13aa-4358-bd24-852b8248d139/pasta_boat_cooking_times.pdf
    • https://uploads.strikinglycdn.com/files/8526d81a-c5ea-4bf1-902f-650649d21f72/what_is_power_yoga_for_weight_loss.pdf
    • https://uploads.strikinglycdn.com/files/aa7d9457-9f66-4403-b061-3a867ae48817/rovofiviborusulolewowo.pdf
    • https://uploads.strikinglycdn.com/files/687844c6-faa0-4e27-bd00-fffd9bba1774/79431884243.pdf
    • https://uploads.strikinglycdn.com/files/88016993-27e9-406d-8c33-07141b9199be/vojikabogu.pdf
    • https://uploads.strikinglycdn.com/files/d05707da-ad86-43ba-992a-03de9bfe8c41/52116662505.pdf
    • https://uploads.strikinglycdn.com/files/d2e684ee-ecd2-4f21-9766-c96b2e4e3666/gejejojati.pdf
    • https://uploads.strikinglycdn.com/files/2269e23d-21b0-49a4-8b09-8ed0846d2deb/94827901050.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ff.bin
18bc3b3e86b60d9b61875e7bd101400647d88b8411611de045c197586f3ff03b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 5080 bytes
font_01_sfnt_off0000fb3e.bin
b8795ab057f4a9fd838d4757ac75498b62931d6dabe861db0f9ab4d9d62683ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 11040 bytes

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