Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ded9950e37a738…

MALICIOUS

PDF

80.8 KB Created: 2021-06-10 12:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 42bc326beaa59a31ce4da2b2c8a3555b SHA-1: c39c7a406c1e86618859a27a39fd93221d044fd6 SHA-256: 90ded9950e37a7382e4dbb8ced05867e89c0271d4fad2eff47535d648b65d849
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'creative book cover template', aligning with the heuristic findings of a link farm designed to redirect users to potentially malicious or ad-filled websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=creative+book+cover+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466679/normal_5fd67b6a7ec84.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/1016983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_60477bb62f37f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_6033a8cea0cf9.pdfIn PDF document text
    • https://bisijonowazupu.weebly.com/uploads/1/3/2/6/132682684/josijekebiso_lusumetige.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff08176b4771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_6054f5cf4f4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_6065d25b1c728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_60025c42db69a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fec769d12686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_6063b01d7ebb0.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/lilegugomepaloxajiv.pdfIn PDF document text
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/misis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_6045496a1b430.pdfIn PDF document text
    • https://kowedogade.weebly.com/uploads/1/3/4/8/134879104/8d40d320be2f703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386335/normal_5fe4092a2cba8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kefimazusob.pbworks.com/f/vowukigik.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144503724/49970713894.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/mezanavibolilevuzomajes.pdfIn PDF document text
    • http://rabumofu.pbworks.com/f/bee_tv_apk_download_for_android.pdfIn PDF document text
    • http://jufugoxula.pbworks.com/f/jogukupebixadifuvajegemiw.pdfIn PDF document text
    • http://koruzepuza.pbworks.com/w/file/fetch/144802389/dawolabulajag.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/marketing_management_15th_edition_by_philip_kotler_and_kevin_keller.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 4872 bytes
SHA-256: 61e813c6a5d10f434aeb84acfcc9b6ca3d4601a7c79ccc4d759b3a7d8500d5ec
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 10752 bytes
SHA-256: 1554b8fadca2b805be781697daf6365fab1feced634a0fa7e5a8aff4504454b2
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378