Malicious PDF — malware analysis report

Static analysis result for SHA-256 806ed69b539962e8…

MALICIOUS

PDF

77.6 KB Created: 2021-06-12 10:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da3091c2c949be787d49160956350b1 SHA-1: 6b281c7b0c173874fa5a8e6f5f59e2eb55ff1922 SHA-256: 806ed69b539962e8bdc287d05dfde2fa37ad29c7bf27b7c9867d3be33354fd7b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/pbw?utm_term=raid+shadow+legends+campaign+farmers
    • https://cdn-cms.f-static.net/uploads/4474722/normal_6014c0f05ab1e.pdf
    • https://cdn-cms.f-static.net/uploads/4369775/normal_603c854eb4783.pdf
    • https://zupudawuliwubil.weebly.com/uploads/1/3/4/2/134265939/juzofu.pdf
    • https://fekakawe.weebly.com/uploads/1/3/1/4/131437222/077194f.pdf
    • https://gikapizuwixa.weebly.com/uploads/1/3/4/0/134097763/fdc749d6e09.pdf
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/8003716.pdf
    • https://cdn-cms.f-static.net/uploads/4387817/normal_600bb1a200dc2.pdf
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/fimegorotumusij.pdf
    • https://boteroxelanivif.weebly.com/uploads/1/3/4/6/134698142/juwiro_zitewomexefit_woxoxosirozi.pdf
    • https://duxojavuse.weebly.com/uploads/1/3/1/4/131483254/pifuxeke-bitisemixita-ribaduguzuf-rijixiwepe.pdf
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/manuluja.pdf
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/tanudujemesutawubuj.pdf
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5fdc424a9695a.pdf
    • https://juxepikipoz.weebly.com/uploads/1/3/4/4/134486641/sabezokubefas-sasunu-vidipilirotajo.pdf
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/setikuxitix_dizajidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ginosofep.pbworks.com/f/candid_physical_education_class_12.pdf
    • http://zewalar.pbworks.com/f/bilamid.pdf
    • http://sogotobev.pbworks.com/f/dawabesijejikuvokexer.pdf
    • http://sirazumebow.pbworks.com/f/dejevinazutinefetiladire.pdf
    • http://karulimomaw.pbworks.com/w/file/fetch/144848604/dracula_malayalam_download.pdf
    • http://pibadaro.pbworks.com/f/milogepewotokafavuwa.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_off0000f153.bin
db7292712879b773bfe8c833bd67af8c7642caedf9f1a79f332def666a34b06a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 5668 bytes
font_01_sfnt_off00010492.bin
c221e34cc45f209e3255ac12714018502c46ff371200671d701c7e7e2fbf5517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10636 bytes

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