Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bed586dd1c916c…

MALICIOUS

PDF

112.0 KB Created: 2021-04-22 08:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d51a781bb98a27425956b3bf4c99daac SHA-1: b4a8a18857bb8ac31815318d7a0ff06e8cbab962 SHA-256: 26bed586dd1c916c62c1c9a2c627f853a5fdb732f9c83a91319221102ce5e939
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically a remote-support tool scam. It contains a large number of external links, many hosted on disposable domains, directing users to download PDF files that likely contain further malicious links or prompts. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing campaign designed to trick users into installing potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://xajibur.ru/strik?utm_term=can+you+be+a+drill+sergeant+in+the+reserves PDF link annotation
    • https://cdn.sqhk.co/jowapezo/0JCfLOa/27799692235.pdfIn PDF document text
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/judise_lugozakipapiwiz.pdfIn PDF document text
    • https://cdn.sqhk.co/jobasalem/gi8Gjdx/teamviewer_quicksupport_mac_os_x.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/cFXjbrO/26467864791.pdfIn PDF document text
    • https://samazixudoreput.weebly.com/uploads/1/3/2/6/132681586/8177034.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/n2Ljg8f/tic_tac_toe_family_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/ZigXRAj/9417283802.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/hgghigZ/mcpro_app_build_companion_blueprints_for_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/gf7jdha/collage_maker_software.pdfIn PDF document text
    • https://vaferomesab.weebly.com/uploads/1/3/4/3/134351928/fawinagubido.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/1IfifhB/crunchyroll_premium_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/1Rja1ha/94197778103.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/fiasicP/24352282257.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/21d613f7-ffbc-4c1d-aca0-462ea8887bb9/68058522163.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/80164777771.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/elite_dangerous_horizons_combat_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672096ff-c8f9-475b-8933-b37ae67b1b0c/74658393263.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/libros_sobre_el_autoestima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8e3c36-dee3-45d3-a832-db18da4c2a06/insert_audio_file_wix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df1295a-615d-4cd0-9c56-d947fbf835fd/tofuluro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a7e171-3137-4af8-9f64-1796fa7b9713/83932493671.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/75586733836.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/74472718040.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D17 5292 bytes
SHA-256: a41d4e6d869d01a205dde21cb2359f57652de7c976a70b3ab8edfb36f00498ac
font_01_sfnt_off00016f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F12 13620 bytes
SHA-256: 5bd3db42ba60a50aca71152377949faa14e58f7d8a88b51e9f90031dd8e95f5f
font_02_sfnt_off00019d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D5E 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330