Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b621160fe7ff18…

MALICIOUS

PDF

37.0 KB Created: 2020-03-18 18:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 485c79a617e1f8816be2f653913ac06d SHA-1: ab6784b0df299a2b935569cd82b515e39adf054e SHA-256: 10b621160fe7ff181f1db24fdf44777d1336152c50bac61673fedf93b2f68422
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, flagged as a 'PDF_SEO_LINK_FARM'. The primary embedded URI, 'http://debrafaithrn.com/uploads/1/3/0/3/130323461/130323461.html#icd+10+code+skin+lesion+face', suggests a lure related to medical information. The ML classifier strongly indicates maliciousness, likely due to the link farm's purpose of redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://debrafaithrn.com/uploads/1/3/0/3/130323461/130323461.html#icd+10+code+skin+lesion+face
    • http://www.bstuckpoodles4u.com/uploads/1/3/0/7/130739190/4089006.pdf
    • http://eonsmoke.shop/uploads/1/3/0/7/130775276/4947521.pdf
    • http://gonskylaw.com/uploads/1/3/0/6/130639729/fezaza.pdf
    • http://marchalong.com/uploads/1/3/0/7/130775231/wavekusunu.pdf
    • http://www.thestylistorange.com/uploads/1/3/0/6/130605462/xijafigel-poroketabufajin.pdf
    • http://colleencochran.com/uploads/1/3/0/5/130551416/6888740.pdf
    • http://wwww.jelleleistra.nl/uploads/1/3/0/3/130380002/dugaxem-fudebuvudi-doviw-xonalag.pdf
    • http://xtravelise.com/uploads/1/3/0/2/130291507/gememoxero-barajurira-zijop.pdf
    • http://ovbeyondtherainbow.org/uploads/1/3/0/7/130739278/3120380.pdf
    • http://zerojb.com/uploads/1/3/0/5/130551864/fibakutilagusu.pdf
    • http://thecarpetcleanersbrisbane.com/uploads/1/3/0/2/130270753/1741890.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_off000067b1.bin
fa1c393df8fefb8be547be699539eb6409bea8000ef65e694a940db03efe6fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 8144 bytes

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