Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9982a9faf6e041…

MALICIOUS

PDF

35.8 KB Created: 2020-04-09 14:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e6d5e1bf1cfc6eba8cda167876608e6 SHA-1: 73204c1e7979a8e6ecfe49fb6de33d15f274d184 SHA-256: 9e9982a9faf6e04147931ad041160b76f342c9f70d9e70ebca0b60f3358628ce
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which are numerically or generically named, indicating a link farm or SEO scam. The document body, though partially corrupted, contains keywords related to medical conditions and software versioning, suggesting a deceptive lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the primary malicious activity appears to be directing users to potentially harmful external sites.

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://ciggysound.com/uploads/1/3/0/6/130621220/130621220.html#herpes+zoster+dermatitis+icd+10+code
    • http://sunfishedesigns.com/uploads/1/3/0/6/130604065/fiwetumo_xijula.pdf
    • http://laprogressischiruska.com/uploads/1/3/1/0/131070525/c8e564ba872.pdf
    • http://skippergroup.eu/uploads/1/3/0/5/130588809/6017185.pdf
    • http://speeclub.org/uploads/1/3/1/1/131164257/7910163.pdf
    • http://derbyshirealcoholadvice.com/uploads/1/3/0/3/130313252/wiberidox.pdf
    • http://riverbendbernedoddle.com/uploads/1/3/0/4/130476146/bapusiben_wixavomi.pdf
    • http://bestieboxboutique.com/uploads/1/3/0/7/130739268/wofaraxuruxigob-xulutituguku-bekenijakowuxiz.pdf
    • http://cc-mgmt.org/uploads/1/3/0/7/130775939/1122129.pdf
    • http://alonsoquintanilla.com/uploads/1/3/0/7/130739731/zerajanosimutofariw.pdf
    • http://ceflb.com/uploads/1/3/0/4/130488920/doluvel.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_off0000653e.bin
94af9205357bc623c26149f537ed35bffd45e1430d6a7fd02c204065e004a45e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653E 7372 bytes

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