Malicious PDF — malware analysis report

Static analysis result for SHA-256 691bed9fc1c8e802…

MALICIOUS

PDF

31.1 KB Created: 2020-05-18 06:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d68b758d648e0c7e7762000bee384eb SHA-1: 8ee5c6ab8af4f1527eb1dd08383c21a2779c9bce SHA-256: 691bed9fc1c8e8021cf1c07b3f6301e652db57ae9bcf58d05e747c5254aa95de
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similarly structured domains, indicating a link farm for SEO manipulation. The document body, though heavily obfuscated, contains references to 'drawing line graph free worksheets' and the authoring application 'wkhtmltopdf', suggesting a lure to download potentially malicious content disguised as educational material. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://witherlysgreenhouse.com/uploads/1/3/0/4/130483309/130483309.html#drawing+line+graph+free+worksheets
    • http://creativeacquisitionsgroup.com/uploads/1/3/1/3/131398447/5707020.pdf
    • http://mysteryshopperjob.us/uploads/1/3/0/6/130620538/8560293.pdf
    • http://remodelkitchenbathroom.com/uploads/1/3/1/4/131452886/riviriragiju.pdf
    • http://richspirit.net/uploads/1/3/0/7/130774969/58cb12df77d869.pdf
    • http://portisheadcounselling.com/uploads/1/3/0/8/130873846/rutomazofufuk-dalisunonut-dodegal.pdf
    • http://shieldcreditprofessionals.com/uploads/1/3/1/4/131406473/xakutipewikifupu.pdf
    • http://htownskydive.com/uploads/1/3/0/3/130324164/4103030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005064.bin
403fc93a62e65887cc15d15fa0e359751a31f4cb404f60e768402eb13b5b577d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5064 9760 bytes

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