Malicious PDF — malware analysis report

Static analysis result for SHA-256 802e09667d2874b1…

MALICIOUS

PDF

31.4 KB Created: 2020-03-11 02:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5f42ab2f80528fea0e8bf459bca140ad SHA-1: e1c104f142f3ca3646bef972bbcbab6767982768 SHA-256: 802e09667d2874b1f127d0bd1b848297bab800ded8212d90a5860f27683efc38
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to PDF files hosted on unrelated domains. This behavior is characteristic of SEO spam or a link farm designed to distribute malicious content or traffic. The ML classifier strongly flagged this PDF as malicious, and the heuristic for a PDF link farm further supports this assessment. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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://taylor--kathryn.rominastiebenphotography.com/uploads/1/3/1/0/131070583/131070583.html#agilent+6850+gc+specifications
    • http://compasseducational.ca/uploads/1/3/0/8/130813526/8425e5906.pdf
    • http://www.brebnerlaw.com.au/uploads/1/3/0/3/130379447/af21a.pdf
    • http://endurancevc.com/uploads/1/3/0/5/130590770/1085118.pdf
    • http://learnhowtoguitar.com/uploads/1/3/0/7/130775629/tufiwiduxew.pdf
    • http://darcmantona.com/uploads/1/3/0/7/130739029/2800727.pdf
    • http://shiatsuthaiyogamassage.com/uploads/1/3/0/3/130313410/8758383.pdf
    • http://sarawiseman.org/uploads/1/3/0/7/130739891/ae137b5.pdf
    • http://photosandburritos.com/uploads/1/3/0/4/130435834/nupufigale.pdf
    • http://www.kristinreallife.com/uploads/1/3/0/7/130738780/3799617.pdf
    • http://webtechxi.net/uploads/1/3/0/2/130287817/2455381.pdf
    • http://www.bowman-landscaping.com/uploads/1/3/0/4/130476203/d094ae306a0840f.pdf
    • http://www.sustainablesiam.com/uploads/1/3/0/9/130969548/2603d01c994231.pdf
    • http://www.familiesspeakout.eu/uploads/1/3/0/6/130639865/a6b67.pdf
    • http://meredithroadrep.com/uploads/1/3/0/7/130776861/bcc54b3.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_off000056a5.bin
3616eae6fc26485b5302bf884a427ddf55ccd3262930ee05d549a4af92cbf622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A5 6536 bytes

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