Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b86f44fdc5cb73…

MALICIOUS

PDF

39.3 KB Created: 2020-05-21 16:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8735199e0909b40d5b3b5ff3a9ee8038 SHA-1: 48cbfa8b0c54d2ae18f11e2502ecb93669bdee6a SHA-256: 68b86f44fdc5cb735f29c947fe407652d0dd6db6c6c7928398c5e13017463c14
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links pointing to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external PDF links. The primary attack pattern appears to be SEO manipulation or the distribution of further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://menstrualmagic.com/uploads/1/3/0/5/130550881/130550881.html#lightweight+portable+shooting+bench+plans
    • http://zombiecloth.com/uploads/1/3/0/6/130620168/vijete_jitobirodefuxuf.pdf
    • http://beautifulimageofboone.com/uploads/1/3/1/0/131070314/rodudufarolal.pdf
    • http://headlandparkartistprecinct.com/uploads/1/3/0/6/130639160/8520287.pdf
    • http://chasingpossibilit.org/uploads/1/3/1/4/131453623/973fca.pdf
    • http://akhal-tekeperformance.com/uploads/1/3/1/3/131379113/pabuvobej.pdf
    • http://unhiddenpilgrim.com/uploads/1/3/1/6/131606612/firavolipa_xuduwopap.pdf
    • http://ranneyquestions.com/uploads/1/3/0/6/130640209/1271327.pdf
    • http://callweinspect.com/uploads/1/3/1/3/131383821/gofawu.pdf
    • http://mona-qatar.com/uploads/1/3/0/7/130739383/4600557.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_off00006ce3.bin
9dd4f51a56ef7885acf4e4202fa4892882d6a3d7c5563a9f7bc4636dc57b4b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE3 11252 bytes

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