Malicious PDF — malware analysis report

Static analysis result for SHA-256 79836455d9045432…

MALICIOUS

PDF

79.4 KB Created: 2021-03-31 01:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0dd8a1ce792c72490bf081f30d818d19 SHA-1: 178c4f7b32f21036283eb5af20632ccb4f1daebe SHA-256: 79836455d9045432ab6168d25aae9bcc29ff861f4ffb95fa1a1385520a635f69
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains a title related to legal processes, likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=rama+judicial+consulta+de+procesos+ejecucion+de+penas+por+apellido PDF link annotation
    • http://kazexezawulozij.mypressonline.com/60155507858.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/linear_functional_analysis_bryan_rynne.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/4224194.pdfIn PDF document text
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/zegagevawukore.pdfIn PDF document text
    • http://bitsracing.net/befixuvoxutesafu6q747.pdfIn PDF document text
    • http://4kuhd.me/29120208923sw5l0.pdfIn PDF document text
    • http://desokore.medianewsonline.com/vi_editor_commands_in_linux_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/jfjdhdP/my_little_princess_game_gems.pdfIn PDF document text
    • http://fortysgjdk.fun/29805383633rwkhj.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/5217829.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/DTlichi/free_website_templates_for_online_auction.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/533dab299a2.pdfIn PDF document text
    • http://7lessons.fun/91288161458eu81f.pdfIn PDF document text
    • http://vbruti.site/vadorivenozulafajurefaku8d1pg.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/gfXiejv/zilatekosumidudip.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/6772792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepawomokatuke.myartsonline.com/96591802714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fe7efd-9bb0-48a7-9e35-da9208c85c88/conceptual_physics_textbook_scavenger_hunt_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44576897-905a-49c6-8d5d-e1f09cde96bd/gmat_coaching_institutes_in_delhi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b628970-37f3-4234-8dbb-61f7825234e5/fundamentos_de_marketing_diego_monferrer_tirado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fed234-d693-4b81-8395-5ba7015bd7e1/votitejakugiwilak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f2c5e4-21c8-4462-a8db-11b96b82b214/tewuvuturapuwutegemekalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1bb6ee-8319-464b-bac5-a397f923ad70/integration_of_trigonometric_functions_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbd759c-a264-4682-a70f-a84f2c5d5f06/matewi.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_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 5300 bytes
SHA-256: 724e249154a14260745502eff8ddc58134c6e5da4be97e999790feee3cfb115b
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 11640 bytes
SHA-256: 2e53f902299c97f71e44d21d67a3392f460eee6c2064a9e6c5fb218986741a6d
font_02_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04