Malicious PDF — malware analysis report

Static analysis result for SHA-256 0938140138c582fc…

MALICIOUS

PDF

40.8 KB Created: 2020-04-11 09:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e126388ed1f7b9d6519fb32163137678 SHA-1: f5745004d00ce9f736e0aaaeccfcc1a48e070ab9 SHA-256: 0938140138c582fc970de22ec08568f3b4ed367ec5eb14af8495e142a96c226d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of many URLs pointing to similarly structured PDF files reinforces this assessment. The document body is heavily obfuscated and contains what appears to be metadata rather than user-facing content.

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://adsl-63-204-18-15.benefitplans.org/uploads/1/3/0/7/130739112/130739112.html#aleluya+de+beethoven
    • http://onceuponahill.site/uploads/1/3/0/5/130588517/favudem.pdf
    • http://ethosanderosoils.com/uploads/1/3/1/4/131452880/832938.pdf
    • http://kittredgellc.com/uploads/1/3/1/3/131379554/59810f9a3bed.pdf
    • http://moskva-sidnej.ru/uploads/1/3/0/6/130603847/4639659.pdf
    • http://iamfionasolis.com/uploads/1/3/0/6/130604498/1509953.pdf
    • http://www.adelaidewebservices.com.au/uploads/1/3/0/4/130490687/e33f633.pdf
    • http://sherpasolutions.com/uploads/1/3/0/5/130550929/bejejaxegu.pdf
    • http://dominicmeyer.ch/uploads/1/3/0/9/130969983/gavusanaje-bafus.pdf
    • http://pearlportraits.net/uploads/1/3/0/9/130969960/ravubej_leserijogobumaw_loloref_fudad.pdf
    • http://247trailerparts.com/uploads/1/3/0/7/130775725/7023599.pdf
    • http://elrodengineeringllc.com/uploads/1/3/1/4/131482952/8130865.pdf
    • http://carolynamurao.com/uploads/1/3/0/4/130476034/d0cef5883c63.pdf
    • http://joinnextlevel.com/uploads/1/3/0/6/130604667/waragi-mezanelevi-widamibamo.pdf
    • http://probionsa.net/uploads/1/3/1/4/131453810/lopisa-nogifaxutevi-duxidid-diviladomi.pdf
    • http://buffalobubbletea.com/uploads/1/3/0/7/130738708/fudoroferixejemabove.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_off00007181.bin
13426edeab1e967dd2a9512f281b3cff2d16fe4465b30a938b3aa356d49fa2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7181 10232 bytes

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