Malicious PDF — malware analysis report

Static analysis result for SHA-256 5244c9cf0c0476b9…

MALICIOUS

PDF

35.2 KB Created: 2020-04-28 14:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e60dd4de68f4ff2d6d2f4ec4d56fe7e9 SHA-1: 6b3db1bc682e8d5e9f06821b4012e2d46ed0a3ad SHA-256: 5244c9cf0c0476b9f923215161466c22fe59f381b1369fcc61cd06c4354bb32d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://akizusushi.com/uploads/1/3/0/4/130483879/130483879.html#android+barometer+sensor+example
    • http://abortionsaudiarabia.com/uploads/1/3/1/1/131164269/8ad80f3af8.pdf
    • http://9f62dcb150.com/uploads/1/3/0/2/130289679/kolemuwon.pdf
    • http://apostolicadventures.com/uploads/1/3/1/4/131453432/puvera.pdf
    • http://dgdallu.no/uploads/1/3/0/5/130543568/649131.pdf
    • http://skmponz-gdynia.pl/uploads/1/3/0/8/130874338/4c02fbad7fe25.pdf
    • http://vote4haymour.ca/uploads/1/3/0/4/130488503/a552ee4.pdf
    • http://bonaventure-ins.com/uploads/1/3/0/4/130489727/302561.pdf
    • http://firstyoutake.com/uploads/1/3/1/4/131406294/4663112.pdf
    • http://ulcrownvolunteers.com/uploads/1/3/0/4/130478347/9aecb.pdf
    • http://elegantcreations.net/uploads/1/3/0/6/130620508/liwarafunopojuviba.pdf
    • http://impacttravelgroup.com/uploads/1/3/0/9/130969184/gajopozoj.pdf
    • http://seatown.social/uploads/1/3/1/4/131437247/3362335.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_off00005fda.bin
f60c933ad189d0e1b5fbdd58ba96f6988d8fc85fd72799d8eef08983f3a537ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 8536 bytes

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