Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea94650aef2af2d7…

MALICIOUS

PDF

72.6 KB Created: 2021-02-05 10:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b114f051c7874134897a59b5bff0d9b5 SHA-1: 9eccbd5e83adc3d665dbffbf3763fc45bc38ad08 SHA-256: ea94650aef2af2d75b9da18c9e4c46050d271dea19d00124f8f207de9414e8b9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of external URIs and the link farm heuristic point towards a tactic of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=mommie+dearest+christina+crawford+pdf PDF link annotation
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/ab19416b76.pdfIn PDF document text
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/domererulefil.pdfIn PDF document text
    • https://cdn.sqhk.co/wapogade/uiagjgj/double_clutching_describes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5fd8e6a5f0c00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469375/normal_5feb5bbfc41c8.pdfIn PDF document text
    • https://cdn.sqhk.co/gevolonovare/4ek6jjD/reader_pro_speed_reading_and_brain_development.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412583/normal_6000bab250847.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/zaruwatikub.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/ehfiinp/verizon_member_id.pdfIn PDF document text
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/bimojufefem-sebuduz-renelizusuziko-moseb.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/id9ibQ9/10782442628.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/heZVggb/space_exploration_problems_and_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/bjiQptw/pac_man_256_pc_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/dgeJYgh/88322690098.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/Ogd3hgz/xefalosoxelusaperar.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/zuwipetemaripolobej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/puxuvekulavimilisomesasi.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/idsa_meningitis_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/ssc_2018_ctg_board_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/vinanodowapobi.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 5460 bytes
SHA-256: afd81a811774c29f47b187db0ad2a898aee4f48859ccb0f573f6686f9c85896f
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 10620 bytes
SHA-256: 6f0dd7bb433efa40a22808693175b1187e59f99a6a34930aeb8fab2ee2e78b1c