Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aaa8a7387eefb6…

MALICIOUS

PDF

80.9 KB Created: 2021-03-25 18:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6503f7e6355965a9df96d8d73f6d84e9 SHA-1: d792b3874f2d2865bdc6ba7036f93dc8a2e18fae SHA-256: 24aaa8a7387eefb68f5b019d5dce0d14bd2e8078b907c013b8f89544b2deb8ed
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/wix?keyword=mine+blocks+seeds PDF link annotation
    • http://vejuwagor.iblogger.org/42225139538.pdfIn PDF document text
    • http://nitodizej.22web.org/what_is_the_difference_between_a_12v_and_20v_drill.pdfIn PDF document text
    • http://vobosivadujilep.22web.org/valifaxovebakokiwiwedim.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/surugilosexefokemuwiz.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/daxenabunaduwibejet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_b05a72cff13946628b04c69e67a07c87.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_e08b40dd4f724137be9a59427973be7c.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_9ab213a669e346f4b726138ccf3db9a1.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_ac3d0d06d5504be79d4b713d843bfc55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9aadb3-a04a-4ae6-8606-451fab51c1b3/kubota_d1105-t-eu1_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3ef8ea-ddcf-4ab8-b8ad-7224bac73486/what_does_e21_mean_on_bush_washing_machine.pdfIn PDF document text
    • http://pidazedovag.epizy.com/hp_deskjet_ink_advantage_2545_error_printing.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_023cfdfb60e04d74aefd3eb084be87c1.pdf?index=trueIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_073faacd80854f8c94b4b9897eb56e73.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_6ed4a155b2d74988ae01eaa4adad54b7.pdf?index=trueIn PDF document text
    • http://kimawawasero.onlinewebshop.net/concurrence_monopolistique.pdfIn PDF document text
    • http://bekisamusexasu.rf.gd/tiwejinipinojenuxufu.pdfIn PDF document text
    • http://dexifenila.rf.gd/child_and_adolescent_development_book.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_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 4836 bytes
SHA-256: 6600d1d15ccc1671baa162589da671e46266c928a9bfa34755509eb9cfb186ce
font_01_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 12212 bytes
SHA-256: 3b4af453edc4e4355f91a7fef76ea600e806207edaad6b135244c90b42065502

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