Malicious PDF — malware analysis report

Static analysis result for SHA-256 147265f90409adb3…

MALICIOUS

PDF

46.7 KB Created: 2020-04-08 14:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 228f65de4d28807c4700cc10e07de8a9 SHA-1: 5ac3e22c589398c1d296b24ac54449069be789a5 SHA-256: 147265f90409adb3f5cf257255d774e3a0328a00c865d04a7c395101bac68c30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also strongly indicated maliciousness. These links likely serve to direct users to potentially malicious websites or for SEO manipulation. No scripts were extracted, but the sheer volume of external links suggests a campaign to drive traffic or host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://unique-security-solutions.com/uploads/1/3/0/5/130588653/130588653.html#canciones+de+mariachi+para+un+amor
    • http://drtrentonjohns.com/uploads/1/3/0/4/130491322/4469211.pdf
    • http://fourlegsofwellness.com/uploads/1/3/1/4/131406449/d1e9b6bb169b.pdf
    • http://smallsuttons.com/uploads/1/3/0/7/130776319/jovosekowojeja.pdf
    • http://amberclements.com/uploads/1/3/0/7/130739445/b029ca6e.pdf
    • http://myshoploft.org/uploads/1/3/0/7/130738525/22b59f62bc.pdf
    • http://verterratex.org/uploads/1/3/0/5/130589338/jofusoxuf.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_off0000750c.bin
956b8f9485cacb466baedbbb21b547799e48566b2e831bd2c4e54e03911e3b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750C 9160 bytes
font_01_sfnt_off0000964d.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964D 16312 bytes

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