Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc083bf4a6993bf3…

MALICIOUS

PDF

127.3 KB Created: 2021-02-26 00:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e67be6a980e8c71e5e3a1c8837ae037c SHA-1: b01723f4b719ea615504bb2ecbd257673fae6627 SHA-256: dc083bf4a6993bf3f74383ef83b4bd81aea2fdadbdfbf68921b73312cd553f68
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or redirector. It contains numerous embedded URLs pointing to disposable domains, many of which are configured as link farms. One critical heuristic identified a link to known malicious redirector infrastructure, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=jason+and+the+argonauts+book+2 In PDF document text
    • http://gedadekenoz.mywebcommunity.org/crane_cool_mist_humidifier_no_mist_pads.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/sony_icfc1pj.cek_clock_radio_with_time_projector.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/30983754273.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/gezililik.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/81966649742.pdfIn PDF document text
    • http://mosasekoz.22web.org/81228724094.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/85845475259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gidepajujida.rf.gd/23922310209.pdfIn PDF document text
    • http://najubizep.epizy.com/padogefez.pdfIn PDF document text
    • http://webibufirug.rf.gd/bushnell_golf_app_android.pdfIn PDF document text
    • http://xakizuwebinul.rf.gd/nupapokoba.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/jump_force_next_dlc_characters.pdfIn PDF document text
    • http://pizibajavodup.epizy.com/circular_saw_rip_guide_ryobi.pdfIn PDF document text
    • http://ropawoma.rf.gd/30_by_30_multiplication_chart_printable.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_off0001b8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8EB 5380 bytes
SHA-256: f5a2be4eb7193f3e631f117660e2da1ba25d0e8870d5e89b7e3fa18a78fbe15f
font_01_sfnt_off0001cb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB2B 10752 bytes
SHA-256: eaf729f97cbd47e669c34dfd88b323213b2193230e6e63815de8dc7034ffe521

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