Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6d4231cfb46178…

MALICIOUS

PDF

35.1 KB Created: 2020-04-09 20:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e3d76647215d33b224a82506f723702b SHA-1: ca41158e019dd98e654fdefad470b3ddbe83417a SHA-256: 0c6d4231cfb46178a2a5c38111985db13707671c18a52448104f6999154b8860
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to external PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these external links, suggesting a link farm or spam distribution tactic. The document body, though partially obfuscated, contains the text 'Michigan english test pdf' and references to the wkhtmltopdf tool, likely serving as a lure to encourage users to click on the malicious links. No scripts were extracted, but the presence of many external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://uppercapedronemedia.com/uploads/1/3/0/5/130588394/130588394.html#michigan+english+test+pdf
    • http://wallmaven.com/uploads/1/3/0/8/130813630/3650373.pdf
    • http://salvadorfitzgerald.com/uploads/1/3/0/7/130739072/2363147.pdf
    • http://northbough.com/uploads/1/3/1/4/131455141/9240418.pdf
    • http://slainteslaine.com/uploads/1/3/0/5/130542853/225f9.pdf
    • http://flowvideo.xyz/uploads/1/3/0/7/130776504/mezezuxadano.pdf
    • http://polotechnologies.com/uploads/1/3/0/6/130621432/xalalanesiguj-mafakalov-dabixedov-lokataniposo.pdf
    • http://copypasteface.com/uploads/1/3/0/4/130476035/5290343.pdf
    • http://9f60klh150.com/uploads/1/3/0/2/130291523/5674722.pdf
    • http://lawnstarstn.com/uploads/1/3/0/3/130323516/sakunor.pdf
    • http://cdgreen.info/uploads/1/3/0/3/130323642/781040.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_off00006127.bin
bc03fc4f8792ba684f4a762d7070e7e7ccce326ef7a6b00e739219a1437a9cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6127 7884 bytes

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