Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bf2f1e1f261afe…

MALICIOUS

PDF

43.5 KB Created: 2020-03-08 05:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4b9f0fcdb7f5566ef8720cdeac604c49 SHA-1: df7de069c08250e1c708d9830a806ec7c7442823 SHA-256: 11bf2f1e1f261afe42ddc421ef7097f0851aa0b4c600a8f940f843d2d4691121
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, identified as a link farm, suggesting a tactic for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the sheer volume of outbound 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://www.xmo1.com/uploads/1/3/0/6/130604955/130604955.html#fluid+volume+excess+in+acute+renal+failure
    • http://listenupmedia.net/uploads/1/3/0/7/130738881/woweran_rikozosaf_sijagisagoriv_xopoxevenitega.pdf
    • http://classicgermancarsforsale.com/uploads/1/3/0/6/130639946/fajinojaxawezil.pdf
    • http://the-wordsmith-academy.com/uploads/1/3/0/4/130483761/8733297.pdf
    • http://pensacoin.com/uploads/1/3/0/3/130313196/tuvijatu_romopezexirabig_sezogokisonag.pdf
    • http://hewhodieswiththemostrunswins.com/uploads/1/3/0/4/130435582/noxemimes.pdf
    • http://zuixinhuangguanwangzhiquanxunwang.br3h.com/uploads/1/3/0/7/130740297/kasiropifovuritevi.pdf
    • http://renemogensen.net/uploads/1/3/0/3/130379295/lowakelorozi.pdf
    • http://happyrecipebox.com/uploads/1/3/0/2/130289692/ranitolijuli.pdf
    • http://www.theferdaris.com/uploads/1/3/0/7/130739755/6773619.pdf
    • http://shaynehullart.com/uploads/1/3/0/5/130589400/7817d9a35dd0a.pdf
    • http://myfirsthustle.com/uploads/1/3/0/5/130550732/1839544.pdf
    • http://www.iletranslates.com/uploads/1/3/0/4/130483492/9169599.pdf
    • http://dream-job.site/uploads/1/3/0/6/130621654/8097670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073eb.bin
f026928fc0dddaf08ef0627c8236de533aca68692d6c92298b074ca4e9e000c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EB 8668 bytes
font_01_sfnt_off00009527.bin
41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9527 2600 bytes

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