Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee79996d1c80e0c…

MALICIOUS

PDF

38.7 KB Created: 2020-06-14 18:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e62992a8514bb8f6cea67a6f750d182b SHA-1: 010ff6f233a6122771f96d3529e792f0972545bc SHA-256: 3ee79996d1c80e0cb3118c204a6dfc3e889d13faba13377f1413ebd8ced71821
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rommaneephuket.com/uploads/1/3/0/7/130739278/130739278.html#vibration+chart+pdf
    • http://alpharettacityinfluencers.org/uploads/1/3/0/5/130588352/laxirofikok.pdf
    • http://ciroadan.net/uploads/1/3/1/1/131164402/felisow.pdf
    • http://bigdannybtraining.com/uploads/1/3/1/1/131164272/6865202.pdf
    • http://byronfennemaod.com/uploads/1/3/1/3/131398164/3442499.pdf
    • http://reverifications.co.uk/uploads/1/3/0/4/130483862/4329708.pdf
    • http://genmakers.com/uploads/1/3/0/4/130436202/remegovodetususopi.pdf
    • http://zombiemanor.com/uploads/1/3/0/5/130590432/luxitef.pdf
    • http://mta-sts.mail.harrisbuilds.com/uploads/1/3/0/4/130488759/c56a9ab5dedf.pdf
    • https://rolaroman.files.wordpress.com/2020/06/zunigakobatomatelufomofi.pdf
    • https://wamobujopo.files.wordpress.com/2020/06/gozelowuruzobilizexe.pdf
    • https://sapofavef.files.wordpress.com/2020/06/diboxukexirabafavimanadit.pdf
    • https://powugukus.files.wordpress.com/2020/06/46799555475.pdf
    • https://rijubunaji.files.wordpress.com/2020/06/gigirejeguzuluri.pdf
    • https://vefejavu.files.wordpress.com/2020/06/57893360087.pdf
    • https://gajufivevitu.files.wordpress.com/2020/06/47086948287.pdf
    • https://vigesewidep.files.wordpress.com/2020/06/zuzidaluwibomilewogepa.pdf
    • https://zitipon.files.wordpress.com/2020/06/26027228246.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_off00006bc8.bin
c4c4250449d99b958f75ead3c1a57616700d030267d6bc7fdbec4f6fdca55f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC8 10516 bytes

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