Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdd717d2f84190c…

MALICIOUS

PDF

39.1 KB Created: 2020-04-22 02:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3237653202484fb373abcf12846bddff SHA-1: 236a8967fefdf63970ce778a78ef44a7f0337f78 SHA-256: dcdd717d2f84190ce7f0e341c9bb14cef400c4a9ec47a4045e9e4d13f3497233
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO poisoning and driving traffic to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'automotive repair books pdf' and references the wkhtmltopdf tool, suggesting a lure to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://photostoriesbyangela.com/uploads/1/3/0/3/130313356/130313356.html#automotive+repair+books+pdf
    • http://sunriseandpinedesign.com/uploads/1/3/0/4/130476098/4275618.pdf
    • http://shirasmitzvah.com/uploads/1/3/0/8/130813059/f48fdfece8ea96b.pdf
    • http://dcanic.com/uploads/1/3/0/5/130590371/debole.pdf
    • http://backseatcharger.com/uploads/1/3/0/2/130289480/wuxavuta.pdf
    • http://everythingribbon.com/uploads/1/3/0/6/130604424/sajowuteba.pdf
    • http://qwertypictures.com/uploads/1/3/1/4/131407036/merul.pdf
    • http://www.spot13studio.com/uploads/1/3/0/6/130604979/18ec62a.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_off0000711b.bin
f5dbd433efb5a225f68c78fb5b4bbaf70ddb97ad52552e7afba3623b00f223ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711B 8284 bytes

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