Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47629b319391a90…

MALICIOUS

PDF

39.2 KB Created: 2020-04-19 14:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0cf60be24d06b78787b6a41e5d612c62 SHA-1: 545bd88e7b2e31bff9f01d8a4483464c9537f41c SHA-256: d47629b319391a903ec0980d49d64a236b48c4a9e9f78be549b4a4fbe147ac25
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes a reference to a manual, suggesting a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://presenthk.com/uploads/1/3/0/4/130490488/130490488.html#bsa+comet+evo+silentium+manual
    • http://kpeggphoto.com/uploads/1/3/0/2/130289415/270d6618f82566.pdf
    • http://suprbit.com/uploads/1/3/1/3/131398024/2485961.pdf
    • http://appnetlosungen.com/uploads/1/3/0/6/130639231/muresijapezo_puzukezifa.pdf
    • http://levelten.shop/uploads/1/3/0/4/130436137/e6aee0.pdf
    • http://intherawtestkitchen.com/uploads/1/3/1/0/131070483/zetabanofovagez_piresufuzu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006714.bin
9c13cd40c352f5c8cd591de0b5ac6460eb3905a2654d1307877f3b243ff2fde2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6714 8064 bytes
font_01_sfnt_off00008655.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8655 2616 bytes

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