Malicious PDF — malware analysis report

Static analysis result for SHA-256 87572672b73e398d…

MALICIOUS

PDF

78.3 KB Created: 2021-03-15 20:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f255f18060f6d7e48be76948736679 SHA-1: a05f1018fdf697d95f094909bd37475c2880442e SHA-256: 87572672b73e398d295707a1bea01038773fbc6b0bf2c32b36f7b1867ecdff7a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to mimic search results for 'cisa study guide 2017 pdf'. The primary malicious URL identified is https://mezovuduw.ru/wix?keyword=cisa+study+guide+2017+pdf, which is likely used to host phishing content or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=cisa+study+guide+2017+pdf
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/bakobuxiz_suviz_solozolitijawod_lokenuzijulow.pdf
    • https://bitigufej.weebly.com/uploads/1/3/5/3/135337089/tobowez.pdf
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/kukafelasajuwobol.pdf
    • http://xesaverilurum.22web.org/34761424293.pdf
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/1397415.pdf
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/jalovad_dojufirefupuj.pdf
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fe1f75e290cf.pdf
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ffa520bd9c90.pdf
    • http://kopavavabigi.66ghz.com/xikifelelukovesidububimix.pdf
    • https://static.s123-cdn-static.com/uploads/4445880/normal_5ffaba01be147.pdf
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/1fd165243791.pdf
    • https://static.s123-cdn-static.com/uploads/4475376/normal_5fe5bfd8f0831.pdf
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/bokibuzasawum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nisoxow/77791748742.pdf
    • https://s3.amazonaws.com/vesubodufisi/bootstrap_contact_form_html_css.pdf
    • http://kefawifilibuvo.rf.gd/riddle_7am_knock_at_the_door_answer.pdf
    • http://luloxefisamo.rf.gd/what_is_a_metaphorical_mask.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_4286be834d9549d5ac7f6104e0d8c781.pdf?index=true
    • https://s3.amazonaws.com/kufazete/customer_services_manager_interview_questions_and_answers.pdf
    • http://sowinoto.epizy.com/xexigiserijofife.pdf
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_b39808e0ea91464eaa314b497b98597e.pdf?index=true
    • https://s3.amazonaws.com/pegek/60741991462.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_off0000f475.bin
a9e1271fce341d80a6f6aae84bd537de45952e7ee8b3b751831f9bc8b269dbeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 5496 bytes
font_01_sfnt_off00010751.bin
28d11d4b70d12aa4637b47411a5fedda372821711340b7b20c176c12ff830896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 10684 bytes

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