Malicious PDF — malware analysis report

Static analysis result for SHA-256 4860408a5be38f24…

MALICIOUS

PDF

77.6 KB Created: 2021-04-03 15:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: eeb223c2ee44f1c7d6bfc8dcb74c5f76 SHA-1: d246049199137a33ded1e68bd5358af3a91ce3d5 SHA-256: 4860408a5be38f2431b9a7235bfadf00ec8bd1343c37859928af231f5f1a2a6b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a PDF link farm, with numerous external URLs embedded within the document. The primary URL, 'https://leonvi.ru/award?keyword=dahua+product+catalog+2020+pdf', suggests a lure related to product catalogs, likely to disguise the malicious nature of the links. The presence of many external links, including those on 'sqhk.co', indicates an attempt to direct users to a network of potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://leonvi.ru/award?keyword=dahua+product+catalog+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/pojuwudedi/hepHzii/jusizajizudiberuwado.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/fgdohmv/brick_builder_star_wars_ucs.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/2ohgRib/amc_24_highlands_ranch_fandango.pdfIn PDF document text
    • http://mojoliziriba.22web.org/nothing_a_chorus_line_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/heK82gi/jixovuvomonase.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/jeigujd/xejefuvejerumifosi.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/jh8NjvB/rawakojegesavuxupelulija.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/ifcOYhh/pofemasudozowumoxoto.pdfIn PDF document text
    • http://dofagagisefukiv.22web.org/vuwijixuwevexeji.pdfIn PDF document text
    • https://cdn.sqhk.co/tujujelo/jgjdjgb/beep_codes_of_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/eujfdif/2944503874.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/pMw9Ohf/8410973403.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
    • https://uploads.strikinglycdn.com/files/aa7195da-95dc-4fff-b859-32e78472295b/ethiopic_bible_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6463581-bb6f-4e70-ad2c-d521bedc7909/brother_hl-2140_flashing_error_light.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_05a9d7218de549ee99d00ebf97a5f11d.pdf?index=trueIn PDF document text
    • http://bexinoj.epizy.com/modal_verbs_list_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58ffda0-a7cb-4495-91e8-0ed18db7278a/zapifavijoforazefamuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733ea49f-cc01-4935-a1d0-67c32e86c2d3/kixibagumutajifigipudix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b3abff-b715-444d-bca3-f7bb87a3680d/apush_review_packet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dccd39-825a-441e-b8e4-869a993f4bdb/gramatica_ingles_basico_para_principiantes.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_54993deba25a4eaba8b7d898bfe6723e.pdf?index=trueIn 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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 5120 bytes
SHA-256: 6e90687bf9730be35a7b344ed85717784ec86066c925d1aee264bd89e4ed568e
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10968 bytes
SHA-256: 8a09db698f005df95261ac6ba98cd43edb1e59d741c5192a9ff1d1fabae3567c
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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