Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f4b3824c983161…

MALICIOUS

PDF

43.5 KB Created: 2020-04-06 10:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2147f8a34ade82a099dbb23acd77f810 SHA-1: 9cd1ad6026b3c34f2aa638ce061e58de11468c0a SHA-256: c3f4b3824c983161f9a3feac8fcd69c2bb21bdf6768c4713290020087f2b98dd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body contains garbled text and a reference to 'Sony pcm d50 price', suggesting a lure for search engine optimization or potentially a phishing attempt. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm and external URIs. No scripts were extracted from this sample.

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://chickboyschickeninasal.com/uploads/1/3/0/4/130490117/130490117.html#sony+pcm+d50+price
    • http://bookofjedism.com/uploads/1/3/0/6/130640032/sekovuluzab.pdf
    • http://opweekdayschool.com/uploads/1/3/0/6/130604764/5739b9eb8c.pdf
    • http://zenyasastudio.com/uploads/1/3/0/5/130588428/06b815d70ad.pdf
    • http://neoshocommunityturf.org/uploads/1/3/0/6/130620505/8819872.pdf
    • http://bamless.com/uploads/1/3/1/4/131454012/f17068c5fd525.pdf
    • http://monthlybenefit.com/uploads/1/3/0/7/130775649/f514ee67b.pdf
    • http://my800waterdamage.com/uploads/1/3/0/7/130775659/rumarunamis_pomopuvovik_fitimivizi.pdf
    • http://atlantapermaculture.com/uploads/1/3/1/4/131407453/lurakali.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_off0000816b.bin
74a810983c80187f1c2fbc1aa72d4efa6ea3eb4162f0dd61a19183b60f786c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816B 7888 bytes

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