Malicious PDF — malware analysis report

Static analysis result for SHA-256 33959be2488e6845…

MALICIOUS

PDF

33.5 KB Created: 2020-04-11 09:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cbb6ffea28b28553d85b3f5a74f41e8d SHA-1: 001e8b827dbba29e1ca142dd4826e338ad35c284 SHA-256: 33959be2488e6845f2432a1bfdf8715968a84563b388e38ea8b91aa687d8a8a1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The ML classifier strongly indicated maliciousness. The embedded URLs point to domains that appear to be part of a link farm, suggesting a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 4

  • 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 http://hotelvic-phase2-ja.devsite-1.com/uploads/1/3/0/9/130968911/130968911.html#closet+rod+dimensions
    • http://fotofauv.com/uploads/1/3/1/1/131164093/2262204.pdf
    • http://lollyspops.shop/uploads/1/3/1/4/131437438/3307412.pdf
    • http://wabicrystalsabi.com/uploads/1/3/0/8/130874142/4489499.pdf
    • http://www.menteriaithcasnewydd.org/uploads/1/3/0/4/130477234/sapukifomuti.pdf
    • http://walteralbertglobal.com/uploads/1/3/0/8/130814187/simolajujoxawawusipi.pdf
    • http://morethanacatch.com/uploads/1/3/0/6/130620800/0744ef4abbe6f.pdf
    • http://legacyrecruits247.com/uploads/1/3/0/4/130436415/b12d7b.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c22.bin
31a47e1a13d0070b0922b30bc23614a828d15d5702b5733ceb85ee5a020fa202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C22 7840 bytes

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