Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c77e164b883051…

MALICIOUS

PDF

82.3 KB Created: 2021-03-16 06:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3d97018a09f2121b2b5d69f1377eca92 SHA-1: e2be64b8c7aacff8fb2fae85af63fe814104754f SHA-256: 41c77e164b883051a370585aaebbea2e425a81e2d47460c8dfb6e604b792b34f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards the document's purpose of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=designing+your+life+pdf+worksheets PDF link annotation
    • https://cdn.sqhk.co/nudofarus/7EkKghO/womalev.pdfIn PDF document text
    • http://coloradocustomelectric.com/daxazuwujokusiziigmmr.pdfIn PDF document text
    • http://kaxogibigonubib.22web.org/formazione_busto_arsizio_volley_femminile.pdfIn PDF document text
    • http://24goodstore.site/342617969970hf38.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/heuieji/42676353520.pdfIn PDF document text
    • http://steblin.pro/359180522108jy63.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/cXKhj0N/54380370728.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/87949093308.pdfIn PDF document text
    • http://arthromedshop.xyz/subaneguwunovumrm8te.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jaid2jb/6383601056.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/bardo_thodol_portugus.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/d8Rr2gf/cross_stitch_patterns_christmas_cards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujekotu.atwebpages.com/best_english_literature_courses_in_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/mukaxer.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/annual_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/32412175166.pdfIn PDF document text
    • http://mezujegaweb.epizy.com/momentum_calculations_worksheet_with_answers_physics.pdfIn PDF document text
    • http://xutasiwewuzaf.rf.gd/white-rodgers_1f95-1291_programmable_thermostat_with_humidity_control.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/kuvabogetadagudivibewudel.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_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 5348 bytes
SHA-256: bebc790baf55106f22618d5ab059d3f59eac317dd81bb03eb049429dbe3cab9b
font_01_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 11232 bytes
SHA-256: 8f53a367038aa43440dcffcf06b382ba09a754f96571a511fabf40bd948378c0

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