Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f894f45fb78ca2c…

MALICIOUS

PDF

37.0 KB Created: 2020-03-28 09:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df4c42aae283f798104885815b2da096 SHA-1: 25e2c090eff832ae0157aea8bb0e1196da171f2f SHA-256: 5f894f45fb78ca2c75f655c136d973c6ffebcbadd8d43944f963a2905eb3468f
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or SEO spam tactic designed to drive traffic to potentially malicious sites. The document body, though partially corrupted, includes a URL that aligns with the heuristic findings of a PDF link farm. No scripts were extracted, but the presence of many external URLs suggests an attempt to redirect users, potentially leading to further compromise.

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://johnsonandsonsservices.com/uploads/1/3/0/3/130313155/130313155.html#problemas+de+multiplicar+con+numeros+decimales
    • http://kuteandkurvy.com/uploads/1/3/0/4/130488851/bewexazubeli-jiwin-zimodipidizajad-movog.pdf
    • http://kc-marren.com/uploads/1/3/0/5/130540176/6c23812155.pdf
    • http://marnivyn.com/uploads/1/3/0/6/130620653/684bc13230d5278.pdf
    • http://cryohousetn.com/uploads/1/3/0/4/130435589/628589.pdf
    • http://www.doceriadanana.com.br/uploads/1/3/0/8/130874475/4613711.pdf
    • http://dumpbodiesinc.com/uploads/1/3/0/8/130813645/gefukelugi.pdf
    • http://4tronics.net/uploads/1/3/0/5/130552043/lerebezarozozene.pdf
    • http://tadpoledryerase.com/uploads/1/3/0/7/130775766/nuvuw.pdf
    • http://martabarandiy.com/uploads/1/3/0/3/130313294/naxuxobalifuvo_motori.pdf
    • http://isolab.ru/uploads/1/3/0/2/130287538/54efb66.pdf
    • http://tjgadgets.com/uploads/1/3/0/4/130489331/kozokuma.pdf
    • http://rolymorrisandcompany.com/uploads/1/3/0/3/130323930/mutonebotusanukabex.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_off00006566.bin
7d4e98868cb0d856b334cb7017e8dafa3602daffc428c5e14ffb57faf2fbacd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6566 8576 bytes

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