Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e8ae8a80e2514a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-21 03:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a792867903bc07caf28895e27a97097a SHA-1: 59324ba14220d24e630e87b5ebe52cc9afdf09ea SHA-256: e4e8ae8a80e2514afe82f38c3da96ca328b1adab1d9707b050f71b0b04e60e22
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=what+do+mandala+tattoos+represent PDF link annotation
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/300651cd.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanunir/ggiegeA/23799925657.pdfIn PDF document text
    • http://bigpleasure.ru/mujelitiziwegijixugutryjy.pdfIn PDF document text
    • http://springital.fun/black_love_stories_on_amazon_primedyq05.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/fdhcKHj/cbse_board_class_9_english_book_solution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_600e79c589e82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367938/normal_5ff1c6cd30ee4.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/kitchenaid_stand_mixer_repair_troubleshootingpczy6.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/ijdjEoj/castle_wars_2._5_hidden_achievements.pdfIn PDF document text
    • http://eurofamily.pro/10630604803i1f5y.pdfIn PDF document text
    • http://lynciguest.com/redukosedagasitujinigiwvxpa.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/jOFhdib/judge_nintendo_switch_review_indonesia.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/3018283.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/nisuxadop.pdfIn PDF document text
    • http://youralteragoods.com/art_of_conquest_dark_horizon_mod_apkhkj27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407991/normal_6017db4411a1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 5212 bytes
SHA-256: a5be72fedfea1c0a540d1427f441fada14c7ede960f413f8dc29496209680b6e
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10868 bytes
SHA-256: 313a90e57769ec41abe08871cf9fe9cf89613eebc31277a3ff1699748913b0a3

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