Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17800592765434a…

MALICIOUS

PDF

73.3 KB Created: 2021-03-05 15:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b10bd7b69a22ca8360ea86c8c634253e SHA-1: c337eed414b1c8fde8445d0bce4af8b321c39b4d SHA-256: e17800592765434a985f52e595fc2a53f3b55092bea63fb66d1f703b7976c2ff
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to '70-410 installing and configuring windows server 2012', likely a lure to attract victims interested in IT certifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/strik?utm_term=70-410+installing+and+configuring+windows+server+2012 PDF link annotation
    • http://kijofizovurisos.medianewsonline.com/bright_line_eating_food_plan.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/niv_study_bible_leather_engraved.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/hdjdimQ/pelican_predator_103_fishing_boat_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/dCibjfy/consulting_math_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/dhdVsjd/carve_pencil_art.pdfIn PDF document text
    • http://br1.red/tamiya_tble-_02s_manualuzi4x.pdfIn PDF document text
    • http://sparzha.club/star_wars_visual_encyclopedia_amazon98t5a.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/dijHJDS/english_song_2020_download_pagalworld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_4d2c541750ef46ee8e391fa818619b2c.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_a4fefbf7d6604807a9282f8f645a53f3.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_887720c7e7634f24bc0a49ae7d6cb953.pdf?index=trueIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/fijofi.pdfIn PDF document text
    • http://bitinorakinin.epizy.com/agenda_template_uk.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_009da1090dbd4d13817505b948b44c8b.pdf?index=trueIn PDF document text
    • http://xekivigevu.rf.gd/possessive_adjectives_worksheets_for_grade_4.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_3ec9fd081a9d42479bfe27d9abe504d9.pdf?index=trueIn 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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 5772 bytes
SHA-256: 831f3e99cf6ca11cca2e211238bb43679d50a19fb827153cab06a629fa9eb3d6
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 10228 bytes
SHA-256: ac46fabd5d9dfe028f3226f4b4c8f14d8c64dafe41be42ab5b1ccffc7e2151ea

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