Malicious PDF — malware analysis report

Static analysis result for SHA-256 b990a1e06de1b35c…

MALICIOUS

PDF

90.6 KB Created: 2021-03-27 18:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6d2d206f35d5c2a8bece12acb07ac49a SHA-1: 54835a063c2618ceaccb60e4fcfb72f2bd26336e SHA-256: b990a1e06de1b35c88d5e6aa1a3485885020876afc8586683e2e87306e310062
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a phishing lure, specifically prompting the user to install a browser extension or update. It leverages multiple external URLs, some hosted on disposable domains, to host the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a malicious script or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/123?utm_term=paiza+pay+mobile+wallet+app PDF link annotation
    • https://cdn.sqhk.co/dilereku/pHji5lT/blood_pressure_by_age_group.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/jSrcbjd/vewisofitox.pdfIn PDF document text
    • https://jedijevabepepox.weebly.com/uploads/1/3/0/7/130739982/c6db4258850.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/97a67.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/giJgjzf/mexafapidarukevukutumufin.pdfIn PDF document text
    • http://grenkasalo4.xyz/pononofijuzisisudatebewdw77.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/iyJigAL/daferito.pdfIn PDF document text
    • http://fishing-rods2.club/playgo_gourmet_kitchen_appliances_toyioblj.pdfIn PDF document text
    • http://yandex-dostav.ru/hilarious_would_you_rather_questions_dirtya1s1d.pdfIn PDF document text
    • http://rankingcoach-apps.com/14135034785h35xf.pdfIn PDF document text
    • https://joxinisedubetif.weebly.com/uploads/1/3/4/5/134594754/6f4c48f02bf1317.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/31f0018e-eafc-4df8-8e1f-c22536a5b4db/fawedavurazagilogin.pdfIn PDF document text
    • http://xewuvafamimeze.rf.gd/zigutileromali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9749dd0f-83bc-4e8e-9a12-e2e61f490feb/75382203611.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/pujebokebamifuletakizaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/heineken_malaysia_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/clinical_biochemistry_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff9844f-565c-4d54-9602-6a1b332d2c68/practice_the_presence_of_god_by_brother_lawrence.pdfIn PDF document text
    • http://rumejumobu.epizy.com/6.0_powerstroke_injector_torque_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/my_side_of_the_mountain_download.pdfIn PDF document text
    • http://fenulujexita.epizy.com/young_dumb_broke_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/what_are_the_requirements_for_gender_reassignment_surgery.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_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 5076 bytes
SHA-256: e8eb927e7e8d0fe07ad64bce41924f86cd2d9a451e1882bf7efe1cc7f411ca30
font_01_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 11292 bytes
SHA-256: 2d04c7501d6698e1fe2c848604d3a14f50c8f5afca567fb1cb4068e394570127

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