Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58153b48ba24211…

MALICIOUS

PDF

35.4 KB Created: 2020-04-21 21:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31a358dc4654393240ab11025c5840e4 SHA-1: 0ee67b6e174fc2f70cfb52a3b07c103e0658a70b SHA-256: c58153b48ba24211b37fece5bcdf2394ede1a1303b77ca4ddafd08d3d62290dc
94 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are dynamically generated and point to seemingly unrelated domains, characteristic of a link farm or SEO poisoning attack. The document body, though heavily obfuscated, contains a reference to 'vehicle accident report dubai' and includes URLs that appear to be part of this lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

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://adamhamdy.net/uploads/1/3/0/7/130740625/130740625.html#vehicle+accident+report+dubai
    • http://sanmarcoscte.com/uploads/1/3/0/6/130620232/fuderonefoben_tiwujobima_vevaze_mafumi.pdf
    • http://citywidepainting.ca/uploads/1/3/0/2/130289765/1efdc36f5d58.pdf
    • http://hollieollieoxenfree.com/uploads/1/3/0/6/130620752/mawikaxidolax.pdf
    • http://clgconsulting.xyz/uploads/1/3/1/4/131453119/9144667.pdf
    • http://angelsunlimited.org/uploads/1/3/0/5/130540026/gadelenavi_dadanilazoba_safag.pdf
    • http://nomoresound.com/uploads/1/3/0/3/130323601/rirarem.pdf
    • http://omahamobilegrooming.com/uploads/1/3/0/5/130590716/wutobiloxo.pdf
    • http://holidayhandymen.com/uploads/1/3/1/4/131437170/9fcc404908803.pdf
    • http://jackson-blue.com/uploads/1/3/0/7/130739626/sizodobujipon.pdf
    • http://phdimensions.com/uploads/1/3/0/7/130776033/wujekemosibubise.pdf
    • http://hopebeyondgrief.org/uploads/1/3/0/2/130287886/afe05b3e9ddb763.pdf
    • http://allegroacademy.net/uploads/1/3/0/6/130621956/8d3c8997ef3.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_off000060c8.bin
635e2f50cbdacaa48c69ecd0c028aea001a346c04438535acd8d002b754133be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C8 8092 bytes

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