Malicious PDF — malware analysis report

Static analysis result for SHA-256 64dcb2c821a7b0b8…

MALICIOUS

PDF

76.7 KB Created: 2021-04-01 23:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1283f5c3e85b25e72eaa1bcae98f3fcb SHA-1: d6e354b57a50e2dd8e6dc9848c78e88d3bac19f7 SHA-256: 64dcb2c821a7b0b82c2b328dd3100abf9a32f1700a2c1699bbaf99b25d434a60
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to disposable domains and one specifically flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=south+indian+vegetarian+recipes+pdf PDF link annotation
    • http://sovolox.getenjoyment.net/24898389490.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/18229498487.pdfIn PDF document text
    • http://opensalle.xyz/what_is_a_guardian_ad_litem_looking_for9v2sf.pdfIn PDF document text
    • http://gidusalutuwisut.iblogger.org/jamofaxev.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/c0edef.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/basic_maths_formulas_for_grezlikd.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/OBiajgm/crash_metal_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalamin/IcRic7T/bakavedodegenudolezorati.pdfIn PDF document text
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/wigegelejunokuzutep.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/iejetYe/best_live_voice_changer_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/yztOicl/free_robux_promo_codes_2020_no_human_verification.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/6548973820.pdfIn PDF document text
    • https://kusezobovezuzeg.weebly.com/uploads/1/3/4/6/134689385/bugadulobunemajokila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_8c432a54769a434680cb3f6117dcadfa.pdf?index=trueIn PDF document text
    • http://xoxudexutuku.rf.gd/definition_of_survey_research_design.pdfIn PDF document text
    • http://vowatul.rf.gd/google_play_app_free_for_pc.pdfIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/phillies_2020_schedule.pdfIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_9b98fd88ffee4de295b732803e2320ab.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_df493b71c7444193b1d006d48f32b156.pdf?index=trueIn PDF document text
    • http://jomupaz.myartsonline.com/behavioral_observation_audiometry.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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 5548 bytes
SHA-256: 8ef37f274dec0bc1f7a6e57b8ebd59cba2f5b2e248eeb06664a2d279bb28a9a9
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10440 bytes
SHA-256: e51dfb137cb073d5b42e8b37d04d6f4f791606a22353029e4b4e1a5c8f206142

Open this report in the interactive analyzer, or submit your own file for analysis.