Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b577367eee01a9…

MALICIOUS

PDF

84.2 KB Created: 2021-04-05 18:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47630c2b3779a4829d55f63bafcd7605 SHA-1: d14e66967af59e8579bf76d282cb39f11411e436 SHA-256: c1b577367eee01a99617b3b5cf88fdc240eee1816c8f104268064f01c44a721f
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to unrelated or suspicious domains, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=uniden+um380+service+manual
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/c6412c.pdf
    • http://kakafeg.scienceontheweb.net/biology_11th_ncert_book_download.pdf
    • https://cdn-cms.f-static.net/uploads/4448985/normal_604463d82abb5.pdf
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fed07bcaba11.pdf
    • https://xusisuzonetov.weebly.com/uploads/1/3/1/4/131456320/mezodarip.pdf
    • http://bebalezuve.medianewsonline.com/cateterismo_cardiaco_complicaciones.pdf
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/bozaguja-gibokogukojufaz-kugifiven-kapofeso.pdf
    • http://bexukavinawexov.mygamesonline.org/95996960302.pdf
    • https://cdn-cms.f-static.net/uploads/4427273/normal_600b1b4b7bee6.pdf
    • https://static.s123-cdn-static.com/uploads/4478125/normal_600128890197a.pdf
    • http://remoliwagofaju.mywebcommunity.org/anthony_giddens_sociologie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxozuvalubi/wolibajiluxologunisi.pdf
    • https://uploads.strikinglycdn.com/files/85183b1e-666e-483f-8cc6-4fd6b423b316/small_business_online_marketing_guide.pdf
    • https://s3.amazonaws.com/xofalepelala/pap_smear_guidelines_ascus.pdf
    • https://s3.amazonaws.com/nabifovu/academia_school_simulator_free_pc.pdf
    • https://s3.amazonaws.com/pujirageg/informant_movie_trailer.pdf
    • https://s3.amazonaws.com/mamukawaxatali/28117292018.pdf
    • https://uploads.strikinglycdn.com/files/124cb0b4-4187-4c7b-b1ca-a4d327dc11d3/python_set_add_all_from_another_set.pdf
    • https://s3.amazonaws.com/defujo/registration_form_template_angular.pdf
    • https://s3.amazonaws.com/jolituzoji/26825592959.pdf
    • https://uploads.strikinglycdn.com/files/5677b9f6-9e2f-46dc-9ace-796618ef343b/pijije.pdf
    • https://s3.amazonaws.com/vefagotoje/3140564967.pdf
    • https://uploads.strikinglycdn.com/files/0a6d1147-d501-4a07-8a4c-1e6a5b958ea4/troy_bilt_horse_tiller_pto_attachments.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/duraflame_20-in_juniper_infrared_electric_fireplace_log_set.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010605.bin
91a28f59d41e23e41cbd1e45c6fb0889c34d7872890b5244dcdcf642690f88de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 5636 bytes
font_01_sfnt_off00011924.bin
67024e4ef004490d120944b9485991ff73b2ef8c2a6debbbda84b5bd30334704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 12584 bytes

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