Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab22aa3d2ea6d254…

MALICIOUS

PDF

83.4 KB Created: 2021-04-21 17:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 26cf6c6fffe7f6c17564b50a1bf4dc8b SHA-1: 790420d3aa3679ac5b6a94e0be2c309b1d31c40a SHA-256: ab22aa3d2ea6d25498582aa16bcdede9350be040162589a0536e4d9d70775bae
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=the+merchant+of+venice+movie+online PDF link annotation
    • http://crysety.xyz/altered_carbon_season_2_plotxd7bo.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/RRmyjaD/28243895896.pdfIn PDF document text
    • https://cdn.sqhk.co/mamuxejoxe/oijhjJj/sudoku_200_puzzles_medium_to_hard.pdfIn PDF document text
    • http://losqutoq.online/243968942275f31n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fca82be38d73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5fc9422098662.pdfIn PDF document text
    • http://idealsit.fun/platform_film_picture_video_mein2v88u.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/ThjXkie/beer_pong_ball_stuck_between_cups.pdfIn PDF document text
    • http://fruitik.space/408220345954b0y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fdc2a1513fec.pdfIn PDF document text
    • https://cdn.sqhk.co/gafazakedoki/hhghjih/elemental_dungeon_mod_apk_1._4.pdfIn PDF document text
    • http://gayerkan.com/486286231195d28o.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/kjaji5l/71174330066.pdfIn PDF document text
    • https://cdn.sqhk.co/zowuvutevak/fifjhdo/79741507325.pdfIn PDF document text
    • https://cdn.sqhk.co/jagavibejabe/R64gzxp/80582073682.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/aggjjhf/universe_in_a_nutshell_apk_kurzgesagt_free.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/jeiezhj/88842302452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd804f24-2472-47cd-90e3-6fea69215620/fezesafididix.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_f946c169d5864d998220f2afc0a29bf8.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_6f9e1c5dc49742368189d5becebcbc58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44475543-f2fe-49c0-9275-fa0dab1e00bb/10785887136.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_6999d89272d64b37acfdfa4355ac2e6e.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a7e9e1b2447640759675ab5200a9ac59.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_109ebb170c7a43f3af7d807450932d3f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 4952 bytes
SHA-256: 1a4a57c4d6e511fa213da3cf2b4f40670d9fbf78402a6f7ddd38a91231fdd7c1
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 11260 bytes
SHA-256: 004efeb500a3c03b9fac1c44bdbd316584622f3885cbbaf53c01067f25056f30