Malicious PDF — malware analysis report

Static analysis result for SHA-256 f389b8564cdf74f9…

MALICIOUS

PDF

38.0 KB Created: 2020-04-01 21:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27614457548329112842de453c85b2bd SHA-1: 614d309e1b27177a1b3c5afe9458d585df391c6d SHA-256: f389b8564cdf74f96773f4699f08081c9e465c11b36320ebbbc4296c295694db
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic or distribute malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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://pcipa.net/uploads/1/3/0/7/130740259/130740259.html#kappa+delta+dagger+meaning
    • http://kristenbarneslcsw.com/uploads/1/3/0/3/130323392/majamozux.pdf
    • http://amoreduet.com/uploads/1/3/0/6/130604523/sekixim.pdf
    • http://rewardmotors.com/uploads/1/3/0/2/130271116/4987261.pdf
    • http://safespacecounseling.com/uploads/1/3/0/7/130739068/9236029.pdf
    • http://omarrivasjaramillo.com/uploads/1/3/0/5/130550797/a468cedf278.pdf
    • http://bdhowardjr.com/uploads/1/3/0/8/130874126/vubodepan.pdf
    • http://glenroyclarke.com/uploads/1/3/0/7/130775516/7455029.pdf
    • http://sajelectricalwa.com/uploads/1/3/0/4/130435741/suniwisudewedamusop.pdf
    • http://witnessconference.org/uploads/1/3/0/7/130740206/2178345.pdf
    • http://adventistasnc.com/uploads/1/3/0/5/130551795/varisu-xariwavanotunu-tubexamumunex-pemaxekibo.pdf
    • http://mooreequineevents.com/uploads/1/3/0/6/130620313/0e385522896b291.pdf
    • http://sfjonesheatingandcooling.com/uploads/1/3/0/2/130272470/vobafu.pdf
    • http://sandwichislandsnetwork.org/uploads/1/3/0/8/130874595/logof_fifowiragufapik.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_off000069fd.bin
7f0d5b80ec4b2a9ca3583329101646f391a786440624a319011fc340caef2a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FD 8696 bytes

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