Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8b68c4651d0f1f…

MALICIOUS

PDF

55.2 KB Created: 2020-05-07 04:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 256486bea22a88471a118a57779fb97b SHA-1: 1a236cb8996bc4f8a40783a610e95aed6d99767a SHA-256: 2d8b68c4651d0f1fe1f7c67e5a67869aac5059e7e8a20cf2a61598af70147803
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO spamming technique. The document body, though partially corrupted, contains text related to 'free bootstrap 4 blog templates' and the wkhtmltopdf application, suggesting a lure to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/1/3/0/4/130491488/130491488.html#free+bootstrap+4+blog+templates
    • http://casacomercialmacaia.com/uploads/1/3/0/5/130550716/2716053.pdf
    • http://datalytechs.com/uploads/1/3/1/0/131070255/nasizutuset-vovibewuxi-veriwofugan-gumosakatakigap.pdf
    • http://santacruzdistributing.com/uploads/1/3/1/0/131070527/kifotozidoj.pdf
    • http://friendsofthebohemia.com/uploads/1/3/1/3/131398259/4028854.pdf
    • http://lazarushandplane.com/uploads/1/3/1/3/131381781/6665024.pdf
    • http://mindfularoma.org/uploads/1/3/0/8/130814065/soxivemeg_goxiwotoz_numabore_wobegugidok.pdf
    • http://bakersfieldtrees.com/uploads/1/3/0/7/130740180/66d9e5c9f.pdf
    • http://kidsotg.com/uploads/1/3/1/4/131413766/2cb14b14241f.pdf
    • http://simmonswagoner.com/uploads/1/3/0/2/130272432/1703773.pdf
    • http://davidloblaw.com/uploads/1/3/0/7/130775269/korevemumidufozopi.pdf
    • http://bootsanddiamonds.org/uploads/1/3/0/6/130621384/lumorut.pdf
    • http://bayareaartsaccess.org/uploads/1/3/0/9/130969340/f0dbfd9fc71.pdf
    • http://nepahomesweethome.com/uploads/1/3/0/4/130490876/9102674.pdf
    • http://poceni-ir-ogrevanje.si/uploads/1/3/0/6/130639540/3161597.pdf
    • http://lamagie.net/uploads/1/3/0/6/130604002/2113387.pdf
    • http://theleftoverchronicles.com/uploads/1/3/0/7/130738553/2823968.pdf
    • http://simmonswagoner.com/uploads/1/3/0/2/13027243
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000ae3a.bin
d08378e6a3c2e9507cd03f93985af21bfe2a96c630aa08a0832c05dcb2e2397b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 10588 bytes

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