Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b818407566c09e3…

MALICIOUS

PDF

37.1 KB Created: 2020-03-28 06:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c69e51ebd0e5faeedaca48fd6e1e1a7b SHA-1: a7dc5be410ce89061b29229e2966db9e2aabff7b SHA-256: 8b818407566c09e377e2cdef18146b8e5645cb7f61d7af8c7ce3f4ece43fb730
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on diverse domains. This behavior is indicative of a link farm or SEO poisoning tactic, designed to drive traffic to potentially malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern.

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://spectraconsultingservices.com/uploads/1/3/0/2/130272350/130272350.html#wordly+wise+3000+book+5+lesson+8+crossword+puzzle+answers
    • http://mta-sts.www.dechampdesigns.ca/uploads/1/3/0/4/130483167/a8bfd25165047c.pdf
    • http://sophieheine.com/uploads/1/3/0/4/130478057/duxitugu.pdf
    • http://ameskornerstore.com/uploads/1/3/0/5/130588702/3269814.pdf
    • http://365bocaiwang.f18.ebkf.org/uploads/1/3/1/0/131070612/jaxivoz_nuwobe_kirorupojo.pdf
    • http://www.mhcs.me/uploads/1/3/0/2/130288399/2730967.pdf
    • http://rambow145.com/uploads/1/3/0/3/130379409/bowas_pusigawoset.pdf
    • http://hostmaster.rathfrilandmotorclub.co.uk/uploads/1/3/0/2/130288875/9678612.pdf
    • http://soldfastwithshawn.com/uploads/1/3/0/5/130540290/vefukarativa.pdf
    • http://audiobookcon.com/uploads/1/3/0/6/130639901/1139978.pdf
    • http://mckinneytechsolutions.net/uploads/1/3/0/3/130379423/kerolurakoke_viporafofemani_fakoki.pdf
    • http://danlynnwatt.com/uploads/1/3/0/5/130551696/98937decf63e.pdf
    • http://chelseyvegas.com/uploads/1/3/0/9/130969076/tibemigubajeloxarezu.pdf
    • http://mail.pkmarch.com/uploads/1/3/0/8/130813649/4557284.pdf
    • http://mountaincreeklodging.com/uploads/1/3/0/7/130775489/pedaponoxaxu.pdf
    • http://premiereathleticrecruiting.net/uploads/1/3/0/5/130590714/xeles.pdf
    • http://aaron-web-test.com/uploads/1/3/0/6/130621290/mezifaweveju-xidabaranev.pdf
    • http://rivertonselfstorage.com/uploads/1/3/0/4/130476085/7170749.pdf
    • http://www.crearchi.be/uploads/1/3/0/7/130775780/welafolekizolidotan.pdf
    • http://www.kisha-allure.com/uploads/1/3/0/6/130603696/41aa1d1bfcdd.pdf
    • http://bandmcrushers.com/uploads/1/3/0/6/130603823/gijunanovu.pdf
    • http://tomnazario.com/uploads/1/3/0/3/130379287/bitavu.pdf
    • http://descomplicando.org/uploads/1/3/0/6/130639511/4440745.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_off00006805.bin
9921539ffe98aae0d5c234e45e539dfe439d30acd1740119d18af356a6bc7a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6805 7156 bytes

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