Malicious PDF — malware analysis report

Static analysis result for SHA-256 75820db7ba15fd7b…

MALICIOUS

PDF

83.8 KB Created: 2021-03-30 04:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d3881a8b60ae2016e6a94b9e8dccc7 SHA-1: 95e5b7f1271f52091b0a1f69e8c9196dfbc0af0f SHA-256: 75820db7ba15fd7bf9abdd0170b6f6c629e0e9ea83ab47045171e1ee6c82ab13
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://xezojetit.ru/123?utm_term=adeste+fideles+latin+pdf
    • http://defokozixeral.sportsontheweb.net/16220896515.pdf
    • http://milatepe.medianewsonline.com/vagoguritakena.pdf
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/9535864.pdf
    • http://kepukarob.sportsontheweb.net/apache_maven_3_tutorial.pdf
    • http://fezanabuxa.22web.org/nuwemixifonajigajozinirez.pdf
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/puwegasok-vapadef.pdf
    • http://papewakoj.22web.org/89621370130.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xurosuforudev.atwebpages.com/dubai_map_with_attractions.pdf
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_0724021454194166ab47cbdd524088dc.pdf?index=true
    • http://wuvasof.epizy.com/toramuvebatomawat.pdf
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_ff6b561117554704936b71bafe5817f0.pdf?index=true
    • http://tofilijewok.atwebpages.com/vewuwanogopenebarino.pdf
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_f29edf96fa164def8f6817f2f0f598dd.pdf?index=true
    • http://silavijegam.epizy.com/2478782242.pdf
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_808cb0d70fbc487cb0baa885d065dc85.pdf?index=true
    • http://bixozebaxikapos.atwebpages.com/80772594505.pdf
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_ae87e4a0076747e391fd2127e19eaee0.pdf?index=true
    • http://laxukumelukadut.myartsonline.com/elenco_complementi_analisi_logica.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_5d0e98182d7c41a2a7f43d192239f9ee.pdf?index=true
    • https://e21f0dd0-e693-4a2a-aa38-6cab66162128.filesusr.com/ugd/34eed6_35295d4e4ce1414fa10ee306bab6167b.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001096a.bin
76d854f3a2db0044310c3ac7795a5d5bf473e8082f11e34bcfa4e0386d19c861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 4928 bytes
font_01_sfnt_off00011a48.bin
7ff9ff6a1a76662489f9f213f4f96e67dfbc4df131782467b8b8c05618eb16d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 12476 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.