Malicious PDF — malware analysis report

Static analysis result for SHA-256 645fa705bea92fc6…

MALICIOUS

PDF

71.8 KB Created: 2021-01-15 15:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8d996cbc73608d588ceac8fca2fcb232 SHA-1: 09198a0c77a24053407721c89a2f9fb083434274 SHA-256: 645fa705bea92fc6e2f587feb81eb0f061ac3c0c5695c307543868950bdc0f2e
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update, which is a common method for credential theft or malware delivery. The document contains multiple embedded URLs, including one pointing to a known malicious redirector at 'ggtraff.ru', and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the nature of the lure suggest it acts as a downloader or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://ggtraff.ru/aws?utm_term=firefox+app++for+laptop In PDF document text
    • https://site-1168410.mozfiles.com/files/1168410/rowing_championships_2018.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/lobev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5f8db05c0f0b4.pdfIn PDF document text
    • https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/6191499.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/jiEUGgh/planetary_alignment_today_broom.pdfIn PDF document text
    • https://dudatagavadupim.weebly.com/uploads/1/3/4/4/134402573/xawelamibot-tukawuso-dililexejegubov.pdfIn PDF document text
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/rubezogupizazu.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/frgeghz/twistee_treat_holiday_hours.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/kigavanus/8677990445.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/academic_vocabulary_in_use_edition_with_answers_2nd_edition.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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 4740 bytes
SHA-256: bcc0533cc1286cb5dcffb28268e3a82990317f7aa4fe0e24419b2a77892ae73b
font_01_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 10708 bytes
SHA-256: ac265cee0a58c017b73dd588fe3ae23bde6531dd9a96434d8dc8a136f8626183

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