Malicious PDF — malware analysis report

Static analysis result for SHA-256 05056ad311e4c8b1…

MALICIOUS

PDF

46.2 KB Created: 2020-04-08 00:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 91b806a85c9700bd9913c6c268021a80 SHA-1: 9c8c0a3fd0f761d30668ee1363aff1559463e90c SHA-256: 05056ad311e4c8b1646d2e6cc68222f04b456fc6d7aa35c737dd525f8faf4493
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, identified by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains text fragments that appear to be related to sports investing and mentions the wkhtmltopdf tool, suggesting a potential lure. The primary function appears to be directing users to a network of linked documents, likely for SEO spam or to distribute further malicious content.

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://andmerchant.org/uploads/1/3/0/4/130483558/130483558.html#sports+investing+profiting+from+poin
    • http://drstacialevy.com/uploads/1/3/1/3/131379578/6815768.pdf
    • http://completecleanni.com/uploads/1/3/0/2/130289784/9431222.pdf
    • http://releifricktal.ch/uploads/1/3/0/7/130776368/vaxuzuxewedovowadiz.pdf
    • http://sportsperformancerevolution.com/uploads/1/3/0/6/130621456/josimivu-beserowi-bokekilamime.pdf
    • http://tylerbertschin.com/uploads/1/3/0/6/130622005/72f80187969e.pdf
    • http://halifaxrealestateblog.net/uploads/1/3/0/7/130739340/727461135eaef.pdf
    • http://cdconline.store/uploads/1/3/0/7/130776720/guwukigur.pdf
    • http://thesalondinner.com/uploads/1/3/0/6/130605453/2749635.pdf
    • http://jsbeautyserv.com/uploads/1/3/0/2/130289745/vifajiz.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_off000074b8.bin
aedeac5014413323958910868e729626189c39385227ee710dc2304414818e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 8532 bytes
font_01_sfnt_off0000955c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x955C 16036 bytes

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