Malicious PDF — malware analysis report

Static analysis result for SHA-256 44358a645d331b85…

MALICIOUS

PDF

78.5 KB Created: 2021-05-07 22:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e21752b77f81570cd3cf5d8f8de8af73 SHA-1: 78632d3ec8afe7f99e48baa09d194c8536f5365c SHA-256: 44358a645d331b8509d6e4e748e2c4278b30128c056eca95c39e7c93225664c7
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for containing malicious redirector links and being part of a link farm on disposable hosting. The embedded URLs, such as 'https://dafemum.ru/strik?utm_term=what+genre+is+frog+and+toad+are+friends', likely serve as the primary mechanism for directing users to malicious content. While no scripts were extracted, the PDF structure itself is designed to host and present numerous links, suggesting a phishing or SEO manipulation attack.

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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+genre+is+frog+and+toad+are+friends In PDF document text
    • https://cdn.sqhk.co/vulovosovem/ibiaifP/child_care_resource_and_referral_agency.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/Pwtiijf/77170929415.pdfIn PDF document text
    • https://cdn.sqhk.co/julubesaf/EiMQjbm/android_webview_open_external_browser.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ehaVVjj/no_speed_limit_sign_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/cIgchew/oneplus_switch_restore_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/i3Hhj3m/sobemunavetixe.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/Mgi3iid/22326372600.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifenax/hicb0jf/39739405401.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/eifYCyT/tatemikuz.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/259ec861a37.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/geKtQlr/gokudotelizo.pdfIn PDF document text
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/a981b665.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/Ljdgd7y/75225796763.pdfIn PDF document text
    • http://ditamozarokid.iblogger.org/84888408697.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/mge7hhV/bug_s_life_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wokuvaxevaji/JHaijfV/4_qul_shareef.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://xolagetomijured.epizy.com/40092362914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9b8530-f230-4008-bce5-f1e95de5ee9b/76850995843.pdfIn PDF document text
    • http://ratimoli.epizy.com/anatomy_of_heart_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94838ce-1434-44cb-b3ca-bca12bf026fc/is_kitchenaid_a_luxury_brand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566048ed-ffcb-41f3-95d5-beda8326020c/21405648803.pdfIn PDF document text
    • http://deneboj.rf.gd/nemaxokejavikopopelofugo.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_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 4936 bytes
SHA-256: ce2b530d8e929b6154d06fc0232ce96ee094c77f13a82f5557495bd6f00de3f6
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10824 bytes
SHA-256: 371f6f842acac46990b9350e5bcda0b5e50f65c829e0cb478fec45cbb4b550ad
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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