Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e2100a70473b3b…

MALICIOUS

PDF

38.0 KB Created: 2020-04-22 11:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36f3377e475660aea7ea17bf65fe50fc SHA-1: 556f82992a8c08bcb7c6fd26e350a323a461f999 SHA-256: a7e2100a70473b3bdebbc157a48e5ed15f3317f85bf5d52addafb977a7b1a3dd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though heavily corrupted, contains text that appears to be a lure for a 'writing task sample'. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of suspicious external websites.

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://zumarock.org/uploads/1/3/1/4/131453132/131453132.html#writing+task+2+sample+answers+pdf
    • http://terrymartinhekker.com/uploads/1/3/0/9/130969874/xojawoseleda_zuxelibun.pdf
    • http://healthnwellnesscbd.com/uploads/1/3/0/4/130483499/7314090.pdf
    • http://michaelfinnigan.net/uploads/1/3/0/7/130739457/fbd0f.pdf
    • http://jshomesolutions.net/uploads/1/3/0/6/130620868/guterudurewagul-rinegov.pdf
    • http://lthconsultingltd.com/uploads/1/3/1/3/131381619/subazalavojoxor.pdf
    • http://niagarafallsphotos.us/uploads/1/3/0/7/130739253/720bd9eeb986b6.pdf
    • http://worldviewschoolofherbalarts.com/uploads/1/3/1/4/131438685/natavavitip.pdf
    • http://omahainternetandtv.com/uploads/1/3/1/3/131398215/d3e9139a753de1d.pdf
    • http://licenterartsciences.com/uploads/1/3/0/5/130590162/6c37d1.pdf
    • http://pristinefamilydentistry.com/uploads/1/3/0/5/130544352/1df650.pdf
    • http://ourweefarm.com/uploads/1/3/1/4/131436967/pasawafakizime-banebepelaj-gezanemuwuli.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_off00006ecb.bin
2e4271867d7e5e7b2693a6a5fc281f2530e80149b750b411713e8066caeecce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECB 7516 bytes

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