Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f85a22f9864f9b…

MALICIOUS

PDF

35.5 KB Created: 2020-03-30 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c3a89b2d0aa226b13d4fdb7f97a7534b SHA-1: a5abe4a86ffa8d8c2d01735d7139ce109713b7a9 SHA-256: 11f85a22f9864f9bdf2fa544cd95bdce8880b1bd605eb9ef63382ae33b97265a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on different domains. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the structure and heuristics point to a malicious document designed to lead users to external resources.

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://washeduphockey.org/uploads/1/3/0/2/130289252/130289252.html#mfj+269+antenna+analyzer+schematic
    • http://china-carparts.info/uploads/1/3/1/1/131164250/kutolo.pdf
    • http://goldensita.com/uploads/1/3/0/5/130588796/gixifitogizopira.pdf
    • http://midwestcomputerservice.net/uploads/1/3/0/5/130551750/182642.pdf
    • http://topteampainting.com/uploads/1/3/0/6/130639152/notuvovodisavax-bosejonotoxu-jutiwej-vonegen.pdf
    • http://poledancefitnesspuertorico.com/uploads/1/3/0/2/130270893/9211fdc3588e91b.pdf
    • http://annamariazielinska.com/uploads/1/3/0/6/130620163/xixopipifewosobelo.pdf
    • http://tdlaero.com/uploads/1/3/0/7/130738919/monuv_xeziriz_bomuxupumofa.pdf
    • http://alannarusnak.com/uploads/1/3/0/3/130312996/kiritel-mokufuzoki.pdf
    • http://cmrconstruction.org/uploads/1/3/0/2/130289369/miduburujoj_xuduzokadoj_denolozun.pdf
    • http://qualityzerox.com/uploads/1/3/1/3/131379536/muzoxegosavori_rolonateporawe.pdf
    • http://jlelliottlaw.com/uploads/1/3/0/6/130640078/fefafananabo_bixoletoto_zumajejo.pdf
    • http://erinian.com/uploads/1/3/1/3/131380625/002b67244f46.pdf
    • http://alpine-digital.com/uploads/1/3/1/3/131380985/9ecff7d2e8.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_off0000628f.bin
d3a014fdbf0966cbb0666f8e5a68d8f2ec6a6613de61f5990eb979048fd478a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628F 8000 bytes

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