Malicious PDF — malware analysis report

Static analysis result for SHA-256 570a274b5ae146c7…

MALICIOUS

PDF

38.9 KB Created: 2020-03-13 23:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 082e28e8eefa4173a00f6facda91b296 SHA-1: 4368b65be50442169e5771fcc423ccae5a14ee06 SHA-256: 570a274b5ae146c7edc70ac95d1f9e6fea453f44653dffc2d44aa65d776a982a
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains. This indicates a link farm or SEO poisoning tactic designed to drive traffic to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://www.morethansoulfood.net/uploads/1/3/0/4/130478484/130478484.html#skf+bearing+removal+kit
    • http://host172.carmichaelnl.com/uploads/1/3/0/6/130604430/gijaripeputejex.pdf
    • http://veteranspeak.org/uploads/1/3/0/7/130739399/93c0cfc1a2a.pdf
    • http://maralynhargrove.com/uploads/1/3/0/4/130435763/nilovoguta-nofimebodu-sozegubotamo.pdf
    • http://thedragonflysisters.com/uploads/1/3/0/5/130589054/2844538.pdf
    • http://titosfiestamexicana.com/uploads/1/3/0/6/130605471/7164176.pdf
    • http://eurekamobilevillage.com/uploads/1/3/0/2/130272636/jabejat.pdf
    • http://mymountains.fr/uploads/1/3/0/4/130435573/duxeveza.pdf
    • http://dorzasdrivingschool.com/uploads/1/3/0/4/130476632/fc0fd.pdf
    • http://chromanose.com/uploads/1/3/0/6/130639599/tejefaxoxej_kipinitobosop.pdf
    • http://pitbull-breed-info.com/uploads/1/3/0/7/130739056/6be1a.pdf
    • http://caregiverscare.org/uploads/1/3/0/7/130776350/ridasemufivawejif.pdf
    • http://ru4christ.net/uploads/1/3/0/6/130639669/c2930bf.pdf
    • http://nuthoppers.com/uploads/1/3/0/2/130272344/didopimoraga.pdf
    • http://surebuildlandscaping.com/uploads/1/3/0/6/130640197/d50d0c527dc51a.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_off00007045.bin
7001060162b2dda7b90f91d5a642d26672d251185af4a524cda94fd560565154		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7045 7920 bytes

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