Malicious PDF — malware analysis report

Static analysis result for SHA-256 f357a186d1a13865…

MALICIOUS

PDF

52.9 KB Created: 2020-04-25 11:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 349d90a370be040e037284dfc890d378 SHA-1: 0167272bc0109a61a27c78ee5c85f9486f54eb1b SHA-256: f357a186d1a13865e0168ae45720af3e68d218692a6ca0139984e7d290604081
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs supports this assessment. The document body appears to be obfuscated or corrupted, but the presence of a URL within it further reinforces the attack pattern.

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://twinelectronicz.com/uploads/1/3/0/6/130621467/130621467.html#1001+arabian+nights+malayalam+pdf
    • http://bestforexrebates.com/uploads/1/3/0/6/130640209/sesosabunosi.pdf
    • http://mokka.app/uploads/1/3/0/8/130813369/be62871ae1f5217.pdf
    • http://intentionalfamilyheritage.com/uploads/1/3/0/6/130603997/6990832.pdf
    • http://aandshardwoodflooring.com/uploads/1/3/0/6/130639710/kibog.pdf
    • http://cattailconstructionllc.com/uploads/1/3/0/7/130739775/lilod.pdf
    • http://familyandbusinesslearning.com/uploads/1/3/0/4/130477039/0027e62e0ad2f5.pdf
    • http://letupper.ch/uploads/1/3/1/4/131452959/225093.pdf
    • http://amber-it.com/uploads/1/3/1/6/131636736/a33b94bc.pdf
    • http://nafym.org/uploads/1/3/1/4/131483109/5976044.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075f8.bin
f4d656c67f1087912cfc45185adb8a6711e9107fc5c89a73f5c81262fe19f538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F8 8616 bytes
font_01_sfnt_off00009696.bin
845c5eef59c84f26bc13ab384e72c1b4b261e28878fa1c720ce4485aaba3edfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9696 16608 bytes
font_02_sfnt_off0000ad83.bin
64ec3e3ab64fc9d3e34cd051333ac15568c3ebbd38bd7c9e2630f2c0816d7954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD83 8512 bytes

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