Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7790092e16b540…

MALICIOUS

PDF

42.0 KB Created: 2020-03-08 10:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f07a468f56f21df0a4fb82543c37788a SHA-1: 6a3d6aa5343fc773f4a217d8e9fb223cd5fae3f9 SHA-256: 2b7790092e16b54052b049ee7b5471389e76dcbabe977fae7eba835881abcb79
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to a resume objective statement, suggesting a lure to entice users to click on the embedded malicious 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://webdisk.collegedemsatiu.com/uploads/1/3/0/8/130814176/130814176.html#resume+objective+statement+for+phd+application
    • http://bnbstyle.net/uploads/1/3/0/6/130639768/281ab.pdf
    • http://tmsmllc.com/uploads/1/3/0/6/130639436/1734523.pdf
    • http://www.oclacrosse.net/uploads/1/3/0/6/130639779/mukuvuximiwaxotus.pdf
    • http://vintageshizzle.com/uploads/1/3/0/5/130550948/gataxosiramiliw_jobamafuruja.pdf
    • http://hcrsolutions.co.uk/uploads/1/3/0/7/130739949/xekirexapopam.pdf
    • http://quietland.com/uploads/1/3/0/6/130621901/521e50b6693c74.pdf
    • http://swoac.com/uploads/1/3/0/3/130379305/gudobinev-kipunifukofola-lavuforogudob-gegudad.pdf
    • http://oridaphotography.com/uploads/1/3/0/4/130483587/5d0d51f06d15.pdf
    • http://downriverkaraokeanddj.com/uploads/1/3/0/2/130272291/vobel.pdf
    • http://www.mmmees.com/uploads/1/3/0/8/130813136/jidajibokomomixi.pdf
    • http://kapustadesign.com/uploads/1/3/0/7/130775456/gubomukexagixa.pdf
    • http://mta-sts.sumacdesign.com/uploads/1/3/0/8/130813577/rekalituk_rorenesetefa_zemevuroloras_wapanaxilelex.pdf
    • http://quantum-solution.com/uploads/1/3/0/2/130272600/borudi-nixoziwa-teroru-xivuvuk.pdf
    • http://changetravels.de/uploads/1/3/0/5/130540186/nitavodapik.pdf
    • http://reviewsofanything.net/uploads/1/3/0/4/130488316/9535582.pdf
    • http://practicallyretired.com/uploads/1/3/0/8/130873828/5878501.pdf
    • http://www.famouscutzbarbershop.com/uploads/1/3/0/3/130313123/4669270.pdf
    • http://oest.juniortalent.dk/uploads/1/3/0/2/130289204/6ae6cb8e8ad8.pdf
    • http://www.margarettellis.com/uploads/1/3/0/2/130291884/6827096.pdf
    • http://lesandclareindustries.com/uploads/1/3/0/5/130551299/tewaj.pdf
    • http://animalcomeback.com/uploads/1/3/1/0/131070993/dikorapewofituze.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_off00007cd5.bin
01ec48b456d158ec76924e49213df0243bb61c3780213647a103ac012fcc2de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD5 7476 bytes

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