Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8fa0bdce5be6eb…

MALICIOUS

PDF

89.9 KB Created: 2020-04-17 05:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf62a94e4d178adb2b7330fe081978fc SHA-1: b06c28a6f14bab13db56c55489b7c9eab5f6ca77 SHA-256: 1d8fa0bdce5be6ebdb6a9118bca57e675fcc970a6adf5d53fccce1f4bbb3b855
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution network for malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://my-jungle.com/uploads/1/3/0/2/130273893/130273893.html#grouping+animals+worksheet+year+4
    • http://mycarenow.us/uploads/1/3/0/6/130604281/wewisokij.pdf
    • http://lucilina.com/uploads/1/3/0/8/130873978/5707953.pdf
    • http://wrestor.net/uploads/1/3/1/1/131164375/binet-viput.pdf
    • http://krazines.org/uploads/1/3/0/5/130546432/2064990.pdf
    • http://salvationarmypeel.com/uploads/1/3/0/6/130639933/kituxosuzab.pdf
    • http://redlaceindustries.com/uploads/1/3/0/3/130379098/gasomolinanuzavix.pdf
    • http://businessopportunityknocking.com/uploads/1/3/0/5/130546392/tonimixogixivis.pdf
    • http://molloymethods.com/uploads/1/3/0/7/130775166/muxonasigowo.pdf
    • http://studioprojektpolska.pl/uploads/1/3/0/8/130873906/debedum.pdf
    • http://amuseboucheentertainment.com/uploads/1/3/0/6/130604601/063d0558abcb3.pdf
    • http://akrosscbc.store/uploads/1/3/0/4/130488946/8909175.pdf
    • http://liveasoundlife.com/uploads/1/3/1/4/131437285/rujisanan-dixorev.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_off000139e3.bin
1399d3e8eed303e49dfbba6b096fbedb545c0bfbe7c79e7e91aabbaadba62112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 8724 bytes

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