Malicious PDF — malware analysis report

Static analysis result for SHA-256 244713a4ac0005a4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-28 11:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55a45f3901cc4425dfde2264ecb3bb53 SHA-1: 386001e426ba04708247349ff896900cb71bd031 SHA-256: 244713a4ac0005a482dd3960c3c751cfc5906819750ac50cabb8ad95a54468b4
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and contains numerous external URIs pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'Vlookup example worksheet', likely intended to trick users into visiting malicious sites. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jumiwimov.ru/123?utm_term=vlookup+example+worksheet
    • http://wurilozi.scienceontheweb.net/nibafig.pdf
    • http://gidilakapajuke.mywebcommunity.org/dezamibebukapifop.pdf
    • http://microbestdigitalmeter.xyz/susemogu4ww7b.pdf
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/4039584.pdf
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/9652677.pdf
    • http://dapujabowigu.sportsontheweb.net/tipicidad_objetiva_y_subjetiva_derecho_penal.pdf
    • http://helplnstagramcontact6088757.com/403710574199wevv.pdf
    • http://gezetola.scienceontheweb.net/programme_botola_2020.pdf
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/7610936.pdf
    • http://idealslimitaly-ufficiale.site/468460272806ti3p.pdf
    • http://teplotronic.ru/ribuwufuxopefeniohv.pdf
    • http://afracheat5.xyz/619422517070end3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a5408817-7a74-4fa4-9c5f-db3f466e7b11/the_lion_the_witch_and_the_wardrobe_ar_reading_level.pdf
    • http://likutolejit.onlinewebshop.net/construction_quality_assurance_plan.pdf
    • https://uploads.strikinglycdn.com/files/60bae499-f211-4e39-9b4b-d5dd3f5984c1/cuales_son_los_numeros_que_mas_salen_en_la_loteria_nacional_dominicana.pdf
    • http://tulifal.onlinewebshop.net/30174905258.pdf
    • https://uploads.strikinglycdn.com/files/9a4b999d-4c8a-42dd-a812-d1f292cfb6a0/why_should_i_recycle_lesson_plan.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/definition_of_management_accounting_reporting.pdf
    • https://uploads.strikinglycdn.com/files/603f68ae-9c80-445b-bbf7-54370fcfe595/63831624847.pdf
    • https://s3.amazonaws.com/rupatojuko/injustice_god_among_us_apk_mod.pdf
    • http://leparitupoxow.onlinewebshop.net/86044039113.pdf
    • https://uploads.strikinglycdn.com/files/de46f856-449a-44a8-aec6-414e233a2d7e/american_eagle_outfitters_logo_history.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_off0000e9e7.bin
6d84266939da31a76795a646ef9edba81d8ed660c8754151567102677aeb92cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 5248 bytes
font_01_sfnt_off0000fba9.bin
1a4dc9c34163f0044ee98b3bd67112cd564048041aab5526331d7932aa637a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 11016 bytes

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