Malicious PDF — malware analysis report

Static analysis result for SHA-256 58db4a09d70af6a3…

MALICIOUS

PDF

71.0 KB Created: 2020-11-28 09:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69ac139981d451cb312eea4154b43476 SHA-1: a7dad093c9e6068d479d8e61470a4f7aa4b00eb4 SHA-256: 58db4a09d70af6a386d5e88ea8a80616b965dd123ee4ba32b0674ff14582fd64
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO manipulation. ClamAV and ML classifiers flagged this as a phishing trojan. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the primary goal is to redirect users to potentially malicious or deceptive websites.

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://trafftec.ru/aws?utm_term=can+hemorrhoids+cause+constipation+yahoo+answers
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/3772485.pdf
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5fb2916d1c2ea.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f87aee10fa2f.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/juxibagunu.pdf
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f91bf187e0d7.pdf
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f8f819712389.pdf
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5fa76616efc71.pdf
    • https://cdn-cms.f-static.net/uploads/4479923/normal_5fad9a6e3f10c.pdf
    • https://benukakaruw.weebly.com/uploads/1/3/4/7/134745121/9092008.pdf
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/zoboleke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bubeto/phim_bo_kiem_hiep_hong_kong_xua.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_off0000da6b.bin
513942316580659565aed380b34e9a86b90191c6988821fd45650ac572f053a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 5380 bytes
font_01_sfnt_off0000ec9d.bin
657a432f0bc735d96d06f890d6969344373f0dac61e37cf8321b2406d098209b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 10224 bytes

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