Malicious PDF — malware analysis report

Static analysis result for SHA-256 3211fe2994b9283a…

MALICIOUS

PDF

34.7 KB Created: 2020-06-20 00:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb13c846ffc4247063613256f6d435c SHA-1: 277bcbe459c8c021a0c584528caf8b6a98f90335 SHA-256: 3211fe2994b9283a22d338d893ef4f480b74b5ec35ade5f04db572a67bd753e7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body text, though partially corrupted, includes the phrase 'Inverter exercise board', suggesting a lure to disguise the malicious intent of directing users to these numerous external URLs.

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://firesystem.org/uploads/1/3/1/4/131437755/131437755.html#inverter+exercise+board
    • http://ycgrown.com/uploads/1/3/0/3/130379178/eb417.pdf
    • http://2c8.undesirable.us/uploads/1/3/0/5/130544447/susivumazatijaxo.pdf
    • http://nprycetest.com/uploads/1/3/1/4/131452954/pukasufizovefor-nurazibomino.pdf
    • http://locksmithnorthphilly.com/uploads/1/3/0/5/130588394/lunuxa-pefobobez-bapegevixum-pamasak.pdf
    • http://mta-sts.peterboroughcohousing.com/uploads/1/3/0/5/130543976/nodezelatux.pdf
    • http://bdsfstate.com/uploads/1/3/0/8/130874283/fewolo.pdf
    • http://scientoxicity.com/uploads/1/3/0/2/130289240/kumidudojozeko.pdf
    • http://sustainablythin.com/uploads/1/3/0/9/130969046/wutinovipa_biduseg_rumumajume_fuduvidalufe.pdf
    • http://agavejax.com/uploads/1/3/0/7/130775403/bosevakuxadakeja.pdf
    • http://suleaccessories.com/uploads/1/3/0/4/130483673/a4afef.pdf
    • http://nadidah.net/uploads/1/3/0/2/130288317/dizewojowetipige.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e76.bin
5a483071792dfdee5ddd1eb25fd3d4b6b34b0c08972f907856e9456be4776f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E76 4896 bytes
font_01_sfnt_off00005f19.bin
bd41ac6818f56e9ce7d2a3fbc632dc2652c9dc5557fb0922534513cc7af975ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 9348 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.