Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c03cb87fa16801…

MALICIOUS

PDF

35.2 KB Created: 2020-04-28 03:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48ea04aace125f5356301c4b27d1f761 SHA-1: 556685aa0cdf4bef256df839ed5a639eb3d2943d SHA-256: 00c03cb87fa16801687d6c418cc53c4bb0d35399e4a8aa20c7a02d8342fc4978
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which is indicative of a link farm attack pattern. These links likely lead to malicious websites or phishing pages. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://zakiaz.com/uploads/1/3/1/4/131454093/131454093.html#sesungguhnya+aku+alif+satar+mp4
    • http://roguecosmetique.shop/uploads/1/3/0/5/130590702/vaxenuxumokoj-xalefumupal.pdf
    • http://rollingoaksmemorialcenter.biz/uploads/1/3/0/4/130475909/5253093.pdf
    • http://houstonaptlistings.com/uploads/1/3/0/6/130604093/6466035.pdf
    • http://allurebridalsma.com/uploads/1/3/0/4/130436173/xugefimizatigo_bawazozadigo.pdf
    • http://perfectlyimperfectbeautifullybroken.com/uploads/1/3/0/8/130814714/juwirujabomana.pdf
    • http://kragero-montessori.no/uploads/1/3/0/4/130488241/989f065337f.pdf
    • http://makeupandexhale.com/uploads/1/3/1/4/131407812/zazanefu.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e1f.bin
a8da46c472e7b478998f5c4b8c65658f4e64120bb36c505b4420e7205308f426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E1F 7456 bytes
font_01_sfnt_off00006b7b.bin
0f23141ba94d37b49c53016ac63a9b008a6ac8e4c4656a8d80e6725f77750189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7B 16140 bytes

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