Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f773e111063637…

MALICIOUS

PDF

40.7 KB Created: 2020-04-08 13:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2215cb7a31e2148a49c5b6383f17b21d SHA-1: bf5eac68d66d0eab96313ad8c75713cfc1146a88 SHA-256: d0f773e1110636378e5e9b5aa15f3a48118ad87726a5eb6642aec7888ac73c38
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be part of an SEO link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to these external sites, which likely serve as landing pages for further malicious activity or to generate ad revenue. No scripts were extracted, and the document body was heavily obfuscated.

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://three-ps-in-a-pod.com/uploads/1/3/1/0/131070798/131070798.html#suma+de+exponentes+de+misma+base
    • http://southeasterndevelopment.org/uploads/1/3/0/5/130543106/9fd08.pdf
    • http://dailycarolinadeals.com/uploads/1/3/0/2/130271217/piduzolololokonapen.pdf
    • http://wildpanzy.com/uploads/1/3/0/4/130490774/2624708.pdf
    • http://the-hair-you-wear.com/uploads/1/3/0/4/130490808/3111435.pdf
    • http://singasongfighter.com/uploads/1/3/1/3/131383456/giwamojifumo.pdf
    • http://hofborluut.com/uploads/1/3/1/0/131070160/2d285a9.pdf
    • http://boutiquehotelbuyout.net/uploads/1/3/0/2/130272470/8587324.pdf
    • http://alhudaia.com/uploads/1/3/1/0/131070539/gagewefoda.pdf
    • http://happytrailsdogwalkers.com/uploads/1/3/0/2/130272435/gazuxiser-mewuguz-tilipov-batedideta.pdf
    • http://havanesesouthafrica.com/uploads/1/3/0/4/130489361/pobemi.pdf
    • http://devieharrison.com/uploads/1/3/0/6/130620628/8d46c54cf.pdf
    • http://chinatowncodes.org/uploads/1/3/0/9/130969424/manajezuxukizuk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a23.bin
8c0ad7b3a95dcd43f4d307662a54ce892e0287ce477ad2e8acbbaa0a6d695c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A23 9184 bytes
font_01_sfnt_off00008ba8.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA8 1708 bytes

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