Malicious PDF — malware analysis report

Static analysis result for SHA-256 201787a47b7b6f76…

MALICIOUS

PDF

84.1 KB Created: 2021-03-27 14:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 99dd1aa153b8cf58b328a2636540b63c SHA-1: 5d2a213ec491b96324ffc88181f47b0e23e38cf6 SHA-256: 201787a47b7b6f76fd223aa19aec38c96cf597597aef16546b7248badbd2a433
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs, with a primary suspicious URL being https://resalured.ru/award. The PDF structure and embedded content suggest it is designed to trick users into visiting this URL, likely to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=ct+angiography+lower+limb+pdf PDF link annotation
    • http://ritual-venki.online/klein_tools_mm2000_user_manualoo0w2.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://zepiteravan.22web.org/81850497909.pdfIn PDF document text
    • http://sibasijiv.22web.org/ghosts_by_raina_telgemeier_full_book_online.pdfIn PDF document text
    • http://xtrading.buzz/how_to_turn_off_gas_water_heater_pilot_lightxzh8y.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/pebeze.pdfIn PDF document text
    • http://spainwow.pro/jufulorekaluvepexebifbbz9.pdfIn PDF document text
    • http://hook-up.fun/19748020924sy7z2.pdfIn PDF document text
    • http://aicberg.net/476273610587mktd.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/fuborubarakosudip.pdfIn PDF document text
    • https://luwajunilekugo.weebly.com/uploads/1/3/4/7/134753683/fupivizafipetometi.pdfIn PDF document text
    • http://exampl1214.com/rekebojeokod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b8ed18-9fdc-4173-a28e-90866b9a8d0b/vivuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/power_outage_report_houston.pdfIn PDF document text
    • http://jolivawojo.rf.gd/the_lord_of_the_rings_the_fellowship_of_the_ring_chapter_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/sandisk_sansa_c240_1gb_mp3_player_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/wibasakevidakakat.pdfIn PDF document text
    • http://napuvonir.epizy.com/6664100971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7562ef7-722d-4317-9f6f-b4f00e1fd84a/how_much_do_traffic_cops_get_paid_uk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 5516 bytes
SHA-256: 88d9777e83bcbe0ec9509f97d496df7d1e3e130917ad3cb1ad8be7225332f895
font_01_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 10496 bytes
SHA-256: 8b522bed63bcfa4fa869c49f1daccc330ed608abbb2814c50db24e478e3283ec

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