Malicious PDF — malware analysis report

Static analysis result for SHA-256 921293a7510fbb54…

MALICIOUS

PDF

48.7 KB Created: 2020-03-12 04:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca066b219c7b3851428c8b5563cf00b5 SHA-1: cfff5ba10e4cbe443f19772e5027a3d87ddf1c72 SHA-256: 921293a7510fbb5448584bcdbf15d68e13e9f5b54bd096b4f9ca70ad110cd832
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness. The document body text is heavily corrupted, but the presence of multiple URLs and the 'PDF_SEO_LINK_FARM' heuristic suggest the primary intent is to redirect users to external sites, potentially for phishing or malware distribution.

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://www.shaynasander.com/uploads/1/3/0/6/130621243/130621243.html#will+pregnancy+cause+stomach+pain
    • http://offpeaktraining.net/uploads/1/3/0/7/130775391/58a19.pdf
    • http://naturesintent.co/uploads/1/3/0/3/130379174/c75f1130868.pdf
    • http://www.walkinmyshoeministry.com/uploads/1/3/0/3/130323362/ruwusoraxukele_luwizuziwapi_gotepemiri.pdf
    • http://nextreview.com/uploads/1/3/0/8/130813314/53598443869706.pdf
    • http://kenoworldwide.com/uploads/1/3/0/5/130541031/4712630.pdf
    • http://gotmonks.net/uploads/1/3/0/4/130483349/wofofovusedu_momaju_pozigibomatama.pdf
    • http://iamump.com/uploads/1/3/0/5/130551423/7665351.pdf
    • http://instrumentaldulcimermusic.com/uploads/1/3/0/6/130604256/5077348.pdf
    • http://m.juoksuklubi.fi/uploads/1/3/0/5/130590363/349642.pdf
    • http://glittertooz.ca/uploads/1/3/0/8/130874129/7017817.pdf
    • http://hostmaster.violets.nl/uploads/1/3/0/4/130483703/22ddad749.pdf
    • http://motorbikerecovery.org/uploads/1/3/0/6/130621406/duwabojizifidapabo.pdf
    • http://cabinafotografica.org/uploads/1/3/0/5/130550888/notuwa.pdf
    • http://joequigley.com/uploads/1/3/0/5/130590140/80a9c.pdf
    • http://chanaconsulting.net/uploads/1/3/0/4/130490687/pujutede.pdf
    • http://circoestodo.org/uploads/1/3/0/6/130605040/e6f604117.pdf
    • http://bluegumchurch.com/uploads/1/3/0/6/130621709/norerorepu-nerefutu-xemev.pdf
    • http://missrosieweddingsandevents.com.au/uploads/1/3/0/6/130604785/rozikol.pdf
    • http://www.roofingbendor.com/uploads/1/3/0/6/130639251/d452d8b216632.pdf
    • http://www.sfitzsimmons.com/uploads/1/3/0/3/130323227/66cb565e29cc.pdf
    • http://www.dallashowell.com/uploads/1/3/0/9/130969115/5546648.pdf
    • http://turkeycreekretrievers.com/uploads/1/3/0/6/130620503/toviwemagibop_kimowuw.pdf
    • http://mta-sts.mail.juuriart.com/uploads/1/3/0/4/130488994/a7f13a6e.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_off00009703.bin
1f45eca9180b3739cf61789d994224cf59c54d7a03988aeea588f47c9f23a678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9703 7724 bytes

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