Malicious PDF — malware analysis report

Static analysis result for SHA-256 1249695bf3acb23e…

MALICIOUS

PDF

32.3 KB Created: 2020-04-07 14:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 95986a53cf138bad52de71b9444463d6 SHA-1: efa073ecb97255e33d14a6424c3725112d195659 SHA-256: 1249695bf3acb23e19dd97a373d8aec8ddda1ec2fb96e18c550514bd15f4cba0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, likely serving as part of this link farm or hosting further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://theleawoodfamilydentist.com/uploads/1/3/1/4/131454027/131454027.html#the+next+step+season+7+episode+1+dailymotion
    • http://hawtwaxart.com/uploads/1/3/0/4/130493248/c3533d71d4b05.pdf
    • http://lisadrakecounselling.com/uploads/1/3/1/4/131453022/toxolenajosagu-wokugolekobod.pdf
    • http://marikati.com/uploads/1/3/0/7/130775197/2638646.pdf
    • http://yourspecialchef.net/uploads/1/3/1/4/131406060/9509644.pdf
    • http://nissanrentalcaroutlet.com/uploads/1/3/0/5/130589099/sekukor.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_off00005762.bin
df82c3c19db7f00ea313619a142870c502aa040cab03a3a8be91d09c4a87532c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5762 7428 bytes

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