Malicious PDF — malware analysis report

Static analysis result for SHA-256 361dcb2b2c02ff53…

MALICIOUS

PDF

56.9 KB Created: 2020-04-11 00:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efa105d5c0b18b808d676ad14053c45e SHA-1: 657d40acecdda462b014daeb75cede3930f939da SHA-256: 361dcb2b2c02ff539bf9f1e5a6337ae8a522899a617120e9eb9ad9afcaeebf29
94 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, characteristic of a link farm, with the primary purpose appearing to be SEO manipulation or distribution of further malicious content. The document body contains obfuscated text and metadata related to its generation, but no direct executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.easterncamocompany.com/uploads/1/3/1/4/131437656/131437656.html#5e+d+d+spells
    • http://nova-hall.com/uploads/1/3/1/4/131407552/gavijika.pdf
    • http://steverodemsconsulting.com/uploads/1/3/0/6/130639803/3259810.pdf
    • http://mclainteam.com/uploads/1/3/1/0/131070753/fb2ddf1cc23.pdf
    • http://sunshinestateadventures.com/uploads/1/3/0/8/130873961/8544556.pdf
    • http://pazassistance.com/uploads/1/3/1/4/131438226/6213749.pdf
    • http://mobilbar.de/uploads/1/3/0/3/130313728/zukofujeb.pdf
    • http://thetwistyoldwitch.com/uploads/1/3/0/7/130739129/74e7f24c0ba.pdf
    • http://nubianmarketplace.com/uploads/1/3/0/6/130604430/30f477ddf5d7970.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_off0000b879.bin
0fd81a775b4b1d30b0fa917143bf0be6d96ecead30a22976530742284c236734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 8244 bytes

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