Malicious PDF — malware analysis report

Static analysis result for SHA-256 395e1541370f7492…

MALICIOUS

PDF

81.2 KB Created: 2021-04-04 03:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5f8d6461afd250df7d37003970e800e SHA-1: 281978a045ce68456288d9929e96b480a85c29de SHA-256: 395e1541370f749277ed9b688d8ab94e0e219d72933669bd1e53d05f3ce89af9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a treadmill manual, directing users to external sites. The presence of many links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=gold%2527s+gym+treadmill+430i+manual
    • http://pocki.top/719999846280c2r5.pdf
    • http://b4shop.icu/luna_nueva_pelicula_completa_en_espa5pg1h.pdf
    • http://zefujixa.mywebcommunity.org/12277239702.pdf
    • https://cdn-cms.f-static.net/uploads/4450046/normal_5fd15d8702093.pdf
    • https://cdn.sqhk.co/napoxanu/jWWulvl/48768020105.pdf
    • http://gopadaxin.mywebcommunity.org/zara_fast_fashion_case_study.pdf
    • http://ukranews.icu/pitubfnzmq.pdf
    • https://cdn.sqhk.co/rumunefa/44jigdw/52768634615.pdf
    • https://cdn-cms.f-static.net/uploads/4367268/normal_60669ed828b38.pdf
    • http://jusapp.club/67253120727w8nxb.pdf
    • https://cdn-cms.f-static.net/uploads/4381543/normal_606163541d198.pdf
    • http://copytoshka.ru/5697921437bn462.pdf
    • https://cdn.sqhk.co/botikavanov/gejebhj/dragon_x_dragon_city_mod_apk.pdf
    • http://pidejofejan.iblogger.org/avery_templates_for_apple_pages.pdf
    • http://juraxoxodas.scienceontheweb.net/nilojon.pdf
    • https://static.s123-cdn-static.com/uploads/4382004/normal_5fe5b2516c87f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pejibuturu.epizy.com/aulad_bhojpuri_movie_free_3gp.pdf
    • http://pepewidi.epizy.com/isometric_grid_paper_1cm.pdf
    • http://nikuzemadol.rf.gd/82059623048.pdf
    • http://watenumedar.rf.gd/acute_pancreatitis_guidelines_2018_acg.pdf
    • http://kofaxafogi.myartsonline.com/mosajig.pdf
    • http://zepuwiz.atwebpages.com/honeywell_building_management_system.pdf
    • http://tagejozef.rf.gd/devi_argala_stotram.pdf
    • http://lirepemewepe.rf.gd/vintage_monarch_lathe_models.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab0.bin
5206e8f38d909499e768e93b603d1dfb379d9c0ed11de9e159f42aba639463bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 5708 bytes
font_01_sfnt_off00010e1f.bin
56e375156e86f22016eae12465b6998d3ca89e2ca2b0b58e456dc57bf127da95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 11664 bytes

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