Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a537fed51a663b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-15 21:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 85ddd19a17fcfac9ceb9c7318ff64906 SHA-1: d21232428b8126490436d26e0294766e4fa2002c SHA-256: b4a537fed51a663b6a21c2da26e35f2e629b97dc27b641ccf9eb8d63b85a342c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be directing users to various websites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=other+movies+like+fifty+shades+of+gray PDF link annotation
    • https://cdn.sqhk.co/zoxogatuv/ieXuQge/zombie_farm_game_ios.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/nubukumodunuwe-duvika-gitavule-zusoxipafe.pdfIn PDF document text
    • http://vinnipoh.space/meri_bamani_song_mp4wm7cs.pdfIn PDF document text
    • http://doucheop.xyz/binary_search_tree_insertion_and_deletion0qgag.pdfIn PDF document text
    • http://natural-shop.info/gesawuzukelidofimo9dl.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/02c2507317b300.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/236207.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/Qgdijgj/royal_offense_2_mod_apk_android_1.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/woloziwaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/0hfhdeF/asteroids_galaxy_tour_around_the_bend.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/15ggzig/35488060987.pdfIn PDF document text
    • https://teroxomiguwadi.weebly.com/uploads/1/3/1/3/131380052/6380554.pdfIn PDF document text
    • http://itchia.space/kupuluxozemiwitidebiixxps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_fc7b11df7a4142df901c1f12ebc0d12d.pdf?index=trueIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_b5bcfa43317c48ae9e1e4ddb66ae25a1.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_b010728b93a140aabd01d27d912a9661.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_06e008a26e984006b6f4ed3fb6762c11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8daa49-ff02-4727-bb9f-62f3c85469a9/faguxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90568c18-11d6-4d83-875e-b52dd3e0ac00/69789718481.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_85b7dbaa24cb4ee29dd0d5a3da2fbefb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f04491c-3bd1-4d68-b584-f30dd18e1258/echo_srm-2100_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0373cd77-55b1-43d1-8fea-8e1ecc4ee5d7/35941958236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee7c05c-ac9f-4cfb-94d5-e73b06ed7bdb/how_to_use_python_3.8_for_beginners.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_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 5576 bytes
SHA-256: 56f45d81f37a6b6cf59d6a570822f25679162bc5395596905a925bb11b382918
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 10580 bytes
SHA-256: 43562be8aa5ce14928fbad94e9658ac7b3007b562feac66f114a6a7aefc0beaf