Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba432077922fbb40…

MALICIOUS

PDF

83.6 KB Created: 2021-03-15 03:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62327bcecfba407e0b822b1440835388 SHA-1: 1b03b3fca15e886c4e67cae6b3f5192298bb83ba SHA-256: ba432077922fbb403326e81244c82c6bbfecb9b87569fef3756100c2393f16a1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malicious redirection attempt. The primary lure appears to be related to 'story writing graphic organizer grade 5', directing users to a suspicious URL. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=story+writing+graphic+organizer+grade+5
    • http://uk-delfin.ru/94003154245beuw2.pdf
    • https://cdn.sqhk.co/wigalefu/mggkw7q/86462602285.pdf
    • https://cdn.sqhk.co/givifevulo/ghbdxVp/54646624844.pdf
    • http://shoop-ft.ru/596390772xj1wg.pdf
    • https://cdn.sqhk.co/kukisigafumi/pigNEgf/download_game_super_soccer_new_season.pdf
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/47d547aa.pdf
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/gajoz.pdf
    • https://cdn.sqhk.co/bovewapop/gBhbggh/20553751975.pdf
    • http://onlyforyou.space/vigujapapavutinaliwugofan2q09i.pdf
    • https://cdn.sqhk.co/fusaduxuw/jiigrhj/daddy_was_a_thief_hack_version_download.pdf
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/276a80797a.pdf
    • https://cdn.sqhk.co/zipirevofu/dbgjsQj/greatest_hits_of_the_80_s_love_songs.pdf
    • https://cdn.sqhk.co/kawonidoza/Qgf6hi3/anime_piano_magic_tiles_pop_music_2_online.pdf
    • https://cdn.sqhk.co/zatovafer/Jhijihi/58814848477.pdf
    • https://cdn.sqhk.co/leluforeref/hdLGNtw/colors_that_go_with_red_brick_house.pdf
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/zosizopuxefini_karitipitod_gibubukefinu.pdf
    • http://lnstagramverificationbadge.com/spiritism_allan_kardec7f48n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a791296a-d576-4cac-81ea-48578628b81c/chocolate_dapple_mini_dachshund_long_hair.pdf
    • https://uploads.strikinglycdn.com/files/45ee8288-a02d-41ca-892b-9289de09028c/tecknet_keyboard_not_connecting.pdf
    • https://uploads.strikinglycdn.com/files/ced3745d-010f-4809-842b-c64e5414c74c/what_to_tell_a_friend_who_is_stressed_out.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106e3.bin
bde5eaf27b799647fb1f5d45b6c15ab8f34c9e579aab920e9c5a2ac289f1203e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 5596 bytes
font_01_sfnt_off00011a13.bin
bcd71f79b900bf6f17c00ac1664d9419381ea3a758984ec207b17af779a709e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 10960 bytes

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