Malicious PDF — malware analysis report

Static analysis result for SHA-256 99243e2a779ae8f3…

MALICIOUS

PDF

87.1 KB Created: 2021-04-01 19:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9681c8df7ddf33b6548e601e9760adcf SHA-1: 719f4452dcfe868f174c9573f12f52d33379bd79 SHA-256: 99243e2a779ae8f3dd4818eeb20e7e625c6f42cb2eb9e32d82197f83bc8c019c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=warehouse+safety+tips+in+hindi PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5ffbe56491022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_6000c9e8c4a3b.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/fyIiiha/rewards_program_bank_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_600ebdc2e35a5.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ZYji3KG/house_of_fear_surviving_predator_pro_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_6052753d236d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5fe99d38ceab2.pdfIn PDF document text
    • https://volexerakonoza.weebly.com/uploads/1/3/4/7/134713377/9799661.pdfIn PDF document text
    • https://sesuzefodapu.weebly.com/uploads/1/3/2/8/132815176/2ada548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5ff29d5b385bf.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/jCjaDk1/rokujakubeladax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408976/normal_5ffac865a4ea7.pdfIn PDF document text
    • https://cdn.sqhk.co/sewenajete/dgf0dhd/duxumixupesafogu.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/4901489.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/lupamufomi_muxetidibap_dipigiregugo.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/SX3SucH/stickman_ninja_hero_gangster_crime_superhero_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_cd3a2ecea2df44f69b32b209af8867a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c938ce37-d50a-4c60-842b-cce69685bacb/79224389781.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_89b609e969a040649f126eecff6fdb3e.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_a41fac10d57c4ea9b430424d77a997da.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_2d841f76f5c74d91baf38e18afc0580b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6f7e39-48c7-46c9-affa-e038719dddc4/vunoxizadazolaweted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a177990-5c94-40a2-82d7-4b99c16ff0ab/wazuxinotogubigot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 5092 bytes
SHA-256: 38d2a08a36c746149fdfbcac11a38411d89e225b7b38cb6ce7c0977f766ff289
font_01_sfnt_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 10144 bytes
SHA-256: a77be2938d05c49063b7987aed5718641d34db0d678cff089320966c5af699f7
font_02_sfnt_off000140b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333