Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffd31d15ee19cbc…

MALICIOUS

PDF

83.8 KB Created: 2021-04-12 01:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0d60cc58a2d574ce01dd313c9fb7b59 SHA-1: d43edb8beb4b2a6f5a346326f60b4387ce0268f1 SHA-256: 9ffd31d15ee19cbc949ff5858d075e0a013471116762317eb416781b3dea047b
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 an embedded URL that redirects to a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, contains references to 'programming for dummies pdf' and 'wkhtmltopdf', suggesting a lure to trick users into downloading or interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=programming+for+dummies+pdf
    • http://kojovud.iblogger.org/integral_formulas_inverse_trigonometric_functions.pdf
    • http://luwogexejel.getenjoyment.net/asvab_test_prep.pdf
    • http://fapasevusiledap.mygamesonline.org/brain_on_fire_online.pdf
    • http://pexukakadom.22web.org/10808404287.pdf
    • http://zepufifusatam.22web.org/surgical_anatomy_of_liver.pdf
    • http://kixamugefuwa.22web.org/colosseum_history.pdf
    • http://resogizona.iblogger.org/mofinekevekifojasaka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gexegubiduw.atwebpages.com/type_d_accouplement_mcanique.pdf
    • http://budezeja.rf.gd/acc_aha_guidelines_antiplatelet_therapy.pdf
    • http://dibadedogiw.epizy.com/33995081030.pdf
    • http://mifijikamipupu.epizy.com/smartsheet_control_center_app.pdf
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_2cbc5943a9f748538350f1ae7c6da265.pdf?index=true
    • http://zotuxegusam.epizy.com/symbicort_budesonide_formoterol_adalah.pdf
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_b3ce6627f7bb45b5933e198d4474755d.pdf?index=true
    • http://soburuwukipo.epizy.com/5996113734.pdf
    • http://zawuzujuw.epizy.com/45120111381.pdf
    • http://xesugowoxufe.epizy.com/blogspot_templates_for_business.pdf
    • http://bizemilibudog.rf.gd/77050421449.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_off0001091e.bin
0adf291be752d5cf99f39fdd1d79dcdf565faa2ba20c2ee8bf7ee05c06f396ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 5332 bytes
font_01_sfnt_off00011b2d.bin
399e9fac945e9bfff4ff430f2036f473711e133bfa4a14bce6c84196758a0990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 11500 bytes

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