Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7c8b1f974bf7b1…

MALICIOUS

PDF

50.3 KB Created: 2020-04-05 07:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df59b8c6d2fd746f7e0d3301f157f986 SHA-1: dbebfdaf9262f5c1d6175ade7bc8316b41c635d7 SHA-256: 5f7c8b1f974bf7b1f4e07306398b4e8b622588156606aa963f31672907169193
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 as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

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://gregjiel.com/uploads/1/3/0/4/130477492/130477492.html#5+beneficios+de+los+hongos+en+la+industria+alimentaria
    • http://garagedoor-repair-ontario-ca.com/uploads/1/3/0/6/130639533/tajowexefogonix.pdf
    • http://dpresources.net/uploads/1/3/0/6/130604423/jimewifivezevogar.pdf
    • http://akeepsakewheatenterrier.com/uploads/1/3/0/6/130621857/fajof-litaka-tupuki-bepane.pdf
    • http://sheriprice.com/uploads/1/3/0/2/130272478/95b31ef5ee41988.pdf
    • http://westcoastoralfacialsurgery.com/uploads/1/3/0/8/130874026/wazolan.pdf
    • http://ozred.net/uploads/1/3/0/7/130739046/ginuxe.pdf
    • http://julielan.com/uploads/1/3/0/4/130435811/vukase.pdf
    • http://sketchbrain.org/uploads/1/3/1/3/131381435/fakobigeror.pdf
    • http://pestcontrolflagler.com/uploads/1/3/0/6/130639616/31f2bf403e022.pdf
    • http://breckroadbc.com/uploads/1/3/0/5/130551859/867454.pdf
    • http://ssunitedstatesreef.org/uploads/1/3/0/6/130622110/9780428.pdf
    • http://bhbqualityassets.com/uploads/1/3/0/5/130588502/a861954cbf.pdf
    • http://cactushomecrafts.com/uploads/1/3/1/3/131380063/wafogixanuxuzi-davuwesadugumaj.pdf
    • http://discgolflittleleague.com/uploads/1/3/0/4/130483337/dipexotunu.pdf
    • http://northwestpetroleum.com/uploads/1/3/0/3/130379206/pulisodimutobe-vivukanexamuvu-rasugikezu.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_off000097f7.bin
bcab3fea0e81bc01a0a6fa35c2537ed27d7f709a0fe96a332c8f1146e1931832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97F7 9392 bytes

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