Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4636d942c32918…

MALICIOUS

PDF

81.5 KB Created: 2021-03-31 13:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 61315635fd408f553bca9a0dc81dc457 SHA-1: cedd96c7682eecd7dfdec3e435ee0a9db245947d SHA-256: 9a4636d942c3291834bbbd43a9d9d5375637ac2a4d33afc22afb9905eeceee72
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, appears to reference software downloads, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=adobe+photoshop+free+trial++mac In PDF document text
    • https://satizuluvom.weebly.com/uploads/1/3/4/4/134481830/4528450.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/romexokizu_keworesor_pisafakira_kotizutuwexi.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/bjbjald/tuzonixukav.pdfIn PDF document text
    • https://gimalijuvilonur.weebly.com/uploads/1/3/4/6/134619020/tumexutijogoriz.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/advanced_english_learning_books.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/zuzabevidaguwaz-lupinitapu.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/djeHMWZ/tenanekomizigodufo.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/what_kind_of_pipe_is_used_for_exhaust.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/monitor_cardaco_polar_a300.pdfIn PDF document text
    • http://zuwaweno.iblogger.org/boatsmart_exam_study_guide.pdfIn PDF document text
    • http://kerosijuvibeg.scienceontheweb.net/dungeons_and_dragons_races_dragonborn.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/igfgip2/87827113179.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/kutevufomagina-gibulodaribezon-petexegexeliku.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/ovgwvy4/15016437363.pdfIn PDF document text
    • https://cdn.sqhk.co/nudavede/pig26tE/the_vikings_movie_soundtrack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexovivuvere.myartsonline.com/where_does_the_exchange_take_place_between_consumers_and_business.pdfIn PDF document text
    • http://zuronixo.rf.gd/38277503155.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/what_does_triage_nurse_mean.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/77140666532.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/addition_and_subtraction_of_polynomials_worksheet_for_grade_7.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/deniren.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_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 5524 bytes
SHA-256: 40bc8eed0e7f684d29b8961cfcbd0ef06ec3f895562c649cf3634aea29359b3c
font_01_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 10780 bytes
SHA-256: cb54f0a9d04f237161023faf32059ab32725467401ef4ad8fc0f6342725a44cf

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