Malicious PDF — malware analysis report

Static analysis result for SHA-256 c892b75d7e1721bd…

MALICIOUS

PDF

35.9 KB Created: 2020-06-11 22:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3fbfac71106c933993d4980dc60d65a SHA-1: ee18b7070ace2c9a029af1a569f54dd890e57e06 SHA-256: c892b75d7e1721bdc4639bf88f9cf8e8b31b6542538e1de85c9bf6a5ef62b44a
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a PDF link farm. The primary heuristic indicates a mass of external PDF links pointing to various domains, suggesting a coordinated effort to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user-facing lures.

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://norwegianwoodworks.net/uploads/1/3/0/5/130538842/130538842.html#bud+not+buddy+answers
    • http://sweetsandtreatscandybuffets.com/uploads/1/3/0/8/130874328/ff3a891812b9d.pdf
    • http://webdisk.sz-lendava.si/uploads/1/3/1/3/131384374/c2b78c724.pdf
    • http://hostmaster.fm-produktiv.de/uploads/1/3/1/3/131381881/najiloxuxuduru_kakomujalulovo_jadavoxiwasa.pdf
    • http://healthylisalee.com/uploads/1/3/0/5/130543064/wiwari_mibadomilesiziz.pdf
    • http://alfredocoelhoart.com/uploads/1/3/1/8/131871499/95609a94a193.pdf
    • http://mikedaledesign.com/uploads/1/3/0/6/130639658/3443415.pdf
    • http://annazanes.com/uploads/1/3/1/8/131856746/tuvagupasupelu.pdf
    • http://aimrecreationtherapy.com/uploads/1/3/0/7/130775688/sodugipeselalofuki.pdf
    • http://tiedinvermont.com/uploads/1/3/0/8/130813851/pejuku.pdf
    • http://haganhempco.com/uploads/1/3/0/5/130551427/5824616.pdf
    • http://tylercodydesigns.com/uploads/1/3/0/3/130323491/1404850.pdf
    • http://kariongphysiotherapy.com/uploads/1/3/0/5/130588923/2825192.pdf
    • http://routestoknowledge.com/uploads/1/3/1/0/131070792/pakesegukakan.pdf
    • http://mta-sts.mail.kareemahsurbanbooks.com/uploads/1/3/0/2/130270869/vunazujavez.pdf
    • https://ranojogirufe.files.wordpress.com/2020/06/15946480889.pdf
    • https://jusuxifigig.files.wordpress.com/2020/06/budezozeduzemuvikuze.pdf
    • https://kugomiregu812748447.files.wordpress.com/2020/06/51680371567.pdf
    • https://xuvisoje.files.wordpress.com/2020/06/xegunoworigikusas.pdf
    • https://nategavi429270663.files.wordpress.com/2020/06/19098061556.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_off000060ef.bin
e14499a4c8624f591d380141846a98b19d9269bad01d183814cc5d0682c508a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x60EF 10212 bytes