Malicious PDF — malware analysis report

Static analysis result for SHA-256 82da1d34331b917b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 18:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a4fd96a45b08eb7a23b19a44c15d4e SHA-1: b273b9570109c1bf61df20be18b8613a873943ae SHA-256: 82da1d34331b917b2547ce4fd084fb68db5904f6c20b84499325b8f7b3e398e9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than a legitimate document. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious websites.

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://dafemum.ru/strik?utm_term=what+is+development+ap+human+geography
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/5902e.pdf
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/romomuxozale_tukatog_kajasudasaz_bewufigovi.pdf
    • http://thecaffeinatedstudent.com/57161378318mbsnl.pdf
    • http://dragonflysagewellness.com/remevidulue1uzk.pdf
    • http://xemizawufogutuf.scienceontheweb.net/capacitor_104.pdf
    • http://zomusip.iblogger.org/xezokolirapefafonijux.pdf
    • http://flowerport.store/passport_club_study_mapvy6gj.pdf
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/13962a9222b6.pdf
    • http://hookup757.fun/best_pencil_drawing_pictures_of_naturesd3vm.pdf
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/d6f667d526e3.pdf
    • http://sowadegepixu.22web.org/6627188796.pdf
    • http://erogan-oficial.site/somnia_anesthesia_salariescjflz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_5005c220b27b4014b7b44769f8b67592.pdf?index=true
    • http://gubadix.epizy.com/visapefesifumazeduzu.pdf
    • http://vesoromu.epizy.com/beaver_lake_fishing_report_2018.pdf
    • http://fotafufoka.epizy.com/xasomasozetivod.pdf
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_33cf4d7f9f4147fab8675154bb3be030.pdf?index=true
    • http://wuragumok.atwebpages.com/geotechnical_engineering_salary_nz.pdf
    • http://fukorow.epizy.com/fabafejumejisoxuwo.pdf
    • http://lagozim.rf.gd/16302582715.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_fe2afdc706f94e7cb2adb4b8e9d1c212.pdf?index=true
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_426d295f5e3d4de3899323aa4327a8b8.pdf?index=true
    • http://bivojeda.atwebpages.com/zefekibibe.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_off0000e9d6.bin
190bee085fd14bebb23d3a36626d12f1ebe742a8efa26860e9f3a30ef901c910		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 5548 bytes
font_01_sfnt_off0000fc9f.bin
19a13da6338d4078dd3f0680518078f3cc51c7acad1318a13de3398a26193d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 11176 bytes

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