Malicious PDF — malware analysis report

Static analysis result for SHA-256 622b3106fdc81a11…

MALICIOUS

PDF

36.1 KB Created: 2020-04-05 12:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 745f5692da10ae0392fad30fc6d5fff4 SHA-1: cf6669c4ee670dac135293e8c17dd77ffea90b41 SHA-256: 622b3106fdc81a11eb6b691712ec41598f0799494c6d7d82336329a0725bfcc2
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL points to a page discussing disqualifying fouls in basketball, but the embedded links lead to numerous other PDF files hosted on various domains. This suggests a link farm or SEO manipulation tactic, potentially to host malicious content or distribute malware indirectly. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://wordsmith-sg.com/uploads/1/3/0/6/130639236/130639236.html#faltas+descalificantes+en+el+baloncesto
    • http://siouxfalls.marketing/uploads/1/3/0/5/130588382/652b74b15.pdf
    • http://mohawkcollegepathfinder.com/uploads/1/3/0/4/130490774/4abbebc7.pdf
    • http://baptisteworks.com/uploads/1/3/0/2/130289096/1144937.pdf
    • http://bikesandbrews.org/uploads/1/3/0/6/130640042/2380457.pdf
    • http://arganics.net/uploads/1/3/0/2/130272070/8154850.pdf
    • http://matthewschultzmusic.com/uploads/1/3/0/4/130476378/sulavaleluj.pdf
    • http://divasdoingbusiness.com/uploads/1/3/0/3/130323437/bbded1eb912d.pdf
    • http://klombardi.com/uploads/1/3/0/9/130969353/6556668.pdf
    • http://dbtproductions.net/uploads/1/3/0/6/130604196/8756866.pdf
    • http://canvastocomputer.com/uploads/1/3/0/5/130551554/09c55560c5236d5.pdf
    • http://expogeografica.co/uploads/1/3/1/3/131398583/limabesimogak.pdf
    • http://tammytally.com/uploads/1/3/0/4/130435745/abd1d5349f7c.pdf
    • http://marymckeownmoak.net/uploads/1/3/1/3/131384368/fimavesipupevuwovi.pdf
    • http://alfredohomes.net/uploads/1/3/0/5/130543667/melajin_lorufegepewet_posobimil_viseve.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_off00006958.bin
fbd4d5e7ec8df93fcc0ab86c65664ac5091506c87855f7df7c15ac0adbcc032b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 7008 bytes

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