Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf06e8ca22cb503f…

MALICIOUS

PDF

71.1 KB Created: 2021-06-08 02:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 682cab0834a090359780ae22aed79d24 SHA-1: 3cc1ab7bd9041aa51da73fffc08388b55bb5e27e SHA-256: cf06e8ca22cb503f49412262c6eeead571efb668cbe3d257631b444697d68902
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://catamma.ru/pbw?utm_term=how+can+i+get+a+service+dog+for+anxiety', is likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://catamma.ru/pbw?utm_term=how+can+i+get+a+service+dog+for+anxiety PDF link annotation
    • https://xazalonabi.weebly.com/uploads/1/3/6/0/136086847/kuvosi-zasexalosujad-zosukajaze-topolosul.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/a6b4069ac58ace.pdfIn PDF document text
    • https://derefejoj.weebly.com/uploads/1/3/4/3/134358497/60e501b390b.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/nokofedo.pdfIn PDF document text
    • https://givudaxoj.weebly.com/uploads/1/3/4/4/134490896/pebowiv.pdfIn PDF document text
    • https://gipuwibozomaz.weebly.com/uploads/1/3/4/8/134891778/5398b8657b.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/7977633.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/9143604.pdfIn PDF document text
    • https://birulevisim.weebly.com/uploads/1/3/4/5/134584726/tejon-logogi.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/2481680.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/28d7b2b64017cbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesowununak.pbworks.com/w/file/fetch/144764115/manual_del_conductor_comercial_de_pennsylvania.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/w/file/fetch/144536595/cyber_hunter_lite_mod_apk_obb_download.pdfIn PDF document text
    • http://degagogo.pbworks.com/f/ziwemuferog.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/estadistica_descriptiva_libro_gratis.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/77806212844.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/zuzakemifirekotokodewake.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/culturally_responsive_teaching_and_the_brain_chapter_summaries.pdfIn PDF document text
    • http://bowawesup.pbworks.com/f/what_are_some_examples_of_competencies.pdfIn PDF document text
    • http://zapibibilubo.pbworks.com/w/file/fetch/144714537/wodavedakusujanepiriraw.pdfIn PDF document text
    • http://vinivat.pbworks.com/f/waxafig.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/pizuzolaziden.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 5440 bytes
SHA-256: 58b86c3b1ceb563d3082595d98a617b9cef48e08ce0be1d50bf8bff0deb7244f
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10452 bytes
SHA-256: 8dd043722dc0ef96fdcc514c9bea78803bb1d754b4b17d5c70af77e8c410b156