Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf6789e2d37e7c3…

MALICIOUS

PDF

88.0 KB Created: 2021-04-02 03:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 257af1772464babef3fefcad8e89e1ed SHA-1: a2fa53fe0ccbd49d8475fe32d60e928ca5e36b92 SHA-256: acf6789e2d37e7c374ed88f4d391f10d0b1577f6e02063588424a6688e9049fb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a phishing lure designed to trick users into installing a browser extension or update. The presence of multiple external URIs, including one flagged as a link farm on disposable hosting, suggests a malicious intent to redirect users to potentially harmful sites. ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gimoguvi.ru/strik?utm_term=how+to+draw+a+female+furry+wolf PDF link annotation
    • http://idealslimitalia-oficial.site/vojofu6mw0f.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/tarirojanogufojogalot.pdfIn PDF document text
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/jubowazusuv-rajaze.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/best_assault_mechs_mwo.pdfIn PDF document text
    • http://niginotan.22web.org/68763517222.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/25421112794.pdfIn PDF document text
    • http://ketadiets.site/11720942566be7sf.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/51536192652.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/ncert_maths_class_11_solutions_download.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/jimofolakepug.pdfIn PDF document text
    • http://gromstroy.com/what_color_is_the_tags_for_2020_in_michiganwn5pw.pdfIn PDF document text
    • http://max-lifting.store/chrome_extension_videoa16sx.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/home_bodyweight_workout_plan.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/38497717245.pdfIn PDF document text
    • https://vivimudovulab.weebly.com/uploads/1/3/1/4/131437737/rowovemobimum_timizema_limisusot_pogiko.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
    • http://dasujisetojasel.epizy.com/11147780763.pdfIn PDF document text
    • http://tofegegumenoz.rf.gd/english_kannada_dictionary_download_free.pdfIn PDF document text
    • http://favudonagoxap.epizy.com/71472445143.pdfIn PDF document text
    • http://xulivef.rf.gd/astm_a106_chemical_composition.pdfIn PDF document text
    • http://nanisoz.epizy.com/avicenne_energy_2020.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/86056365493.pdfIn PDF document text
    • http://pofebevasusin.rf.gd/icao_annex_10_vol_2.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_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 4756 bytes
SHA-256: e7f65981f0d3eb536732f077e83b6f46afcc6904cf88082911b1197fa0bfdf78
font_01_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 10572 bytes
SHA-256: 04d754a0edf4b35504967b40e27039c3cfc09b6b4279a7cb92cc4239ca90fa02
font_02_sfnt_off000142de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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