Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c22e194a536d73…

MALICIOUS

PDF

37.7 KB Created: 2020-04-11 02:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 142816ee4203fe3cafe897fcd23fa395 SHA-1: dc4034ddb91e035b245227994e6baa7463f96ac8 SHA-256: b2c22e194a536d73c71eb37fa69fcb8f5450d156adb6a0e6913c54e9d72e41dc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm designed to manipulate search engine results or to host malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous SEO-linked PDFs suggests a lure for further malicious activity.

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://74-123-77-221.mgwnet.com/uploads/1/3/0/6/130605036/130605036.html#cindy+trimm+commanding+your+morning+prayer
    • http://local689matters.com/uploads/1/3/1/3/131398541/9ada46b091.pdf
    • http://morpheusgraphix.com/uploads/1/3/0/4/130478609/62403cf03565b.pdf
    • http://presson-products.com/uploads/1/3/0/3/130379293/39fb4b.pdf
    • http://a2equine.com/uploads/1/3/0/5/130551323/abebc673b.pdf
    • http://fajocreatives.com/uploads/1/3/0/6/130620888/wexuvofoduvajul_xagawo_kazuwadi.pdf
    • http://gcshading.com/uploads/1/3/1/4/131409167/fosofifivirenejezaw.pdf
    • http://saraelise29.org/uploads/1/3/0/2/130272372/wokugamip-jugusil-lugep-gitovusoz.pdf
    • http://anxietyfreepregnancy.com/uploads/1/3/0/6/130604881/3590318.pdf
    • http://thesassandhoneyco.com/uploads/1/3/1/3/131383599/bemorolopopo_gusunifowizuj_ragul.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_off000061b3.bin
8d500282a65b7e8b7dd7bce12484032806172032121df87bf65cd640cf5f1b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B3 8136 bytes
font_01_sfnt_off00008141.bin
87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8141 2596 bytes

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