Malicious PDF — malware analysis report

Static analysis result for SHA-256 9941e8f51e3a5d2e…

MALICIOUS

PDF

35.7 KB Created: 2020-03-27 05:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f54c114799136075df1a275dd0e2c32d SHA-1: 7b0a336cac35f4c18fda555957da29844a6707d2 SHA-256: 9941e8f51e3a5d2e60889d7ffe8e33e8ec00ddf76d31ac7f1971d44d108bb07a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was identified as malicious by an ML classifier with high confidence. It functions as a link farm, containing numerous external URLs pointing to other PDF documents. The primary attack pattern appears to be distributing traffic to a large number of unrelated domains, likely for SEO manipulation or to serve as a distribution point for further malicious content. The presence of many external links within a small PDF is a strong indicator of this behavior.

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://foothillsbiblefellowship.com/uploads/1/3/0/8/130813132/130813132.html#sap+release+strategy+configuration
    • http://lansingmihomesforrent.com/uploads/1/3/0/5/130588784/feganejuxife_menavuxivaso_vanobosuwatel_xadewamitep.pdf
    • http://showstock.directory/uploads/1/3/0/7/130775379/visilup_nofajemidage_junilixufixiz.pdf
    • http://www.2017.nordstadjugend.lu/uploads/1/3/0/6/130604351/8016910.pdf
    • http://www.michaelsilveyiptec.com/uploads/1/3/0/7/130775837/6922478.pdf
    • http://realtidylawns.com/uploads/1/3/0/2/130289724/7c7b0b39.pdf
    • http://virtualsaguaroapps.com/uploads/1/3/0/3/130379210/29683eb074ea3.pdf
    • http://www.newlifebirthstories.com/uploads/1/3/0/8/130874521/jejinomelo-fowugapufubosu-tonebotedaj.pdf
    • http://mail.sandyblaisdell.com/uploads/1/3/0/5/130540134/8526532.pdf
    • http://www.gritpath.com/uploads/1/3/0/6/130620672/lofijonafujine-tajadudekaf.pdf
    • http://www.cleodiapercake.com/uploads/1/3/0/9/130969458/65cb93b.pdf
    • http://pcpperezcommercialpainting.net/uploads/1/3/0/8/130874469/sizobesukiwar.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_off00006419.bin
2bb11dbe9228a6afabcd5301624e71c1b4389a70cb6c587f1e58ffdb1a82ce48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6419 7620 bytes

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