Malicious PDF — malware analysis report

Static analysis result for SHA-256 4299385ab4ebbeee…

MALICIOUS

PDF

74.5 KB Created: 2021-03-21 02:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6ed1faa15d7e41963f17aed6c61eebb5 SHA-1: 88fbef4d282543c9457e91c1d947f9ff37b381f7 SHA-256: 4299385ab4ebbeee6f7955aa1986e00b9778344ac0ea701e8eb0b2dc01d7c58f
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as https://jacksth.ru/strik?utm_term=galaxy+s9+plus+screen+replacement+cost+in+ghana, suggest a phishing or malware distribution attempt, likely using a lure related to product information. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious intent to redirect the user to potentially harmful content.

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://jacksth.ru/strik?utm_term=galaxy+s9+plus+screen+replacement+cost+in+ghana PDF link annotation
    • http://idealslimitaly-ufficiale.site/1996399105910j0p.pdfIn PDF document text
    • http://aires.fun/shankar_ias_environment_book_6th_editionsw0oc.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/uN2rjj9/top_music_2020_clean.pdfIn PDF document text
    • http://tetoxukipim.getenjoyment.net/gutawebunaguledoziram.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/XHfWXig/kapidepesikivikopazebir.pdfIn PDF document text
    • https://cdn.sqhk.co/paxajirawegu/cVhiiiX/amarakosha_in_kannada_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/jzy1Zie/box_app_android_download.pdfIn PDF document text
    • http://dafilor.iblogger.org/61020009084.pdfIn PDF document text
    • http://kezijumedet.mypressonline.com/adobe_acrobat_reader_free_download_for_windows_8.pdfIn PDF document text
    • http://retenenu.iblogger.org/mugafovevitokenaw.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/72009215962.pdfIn PDF document text
    • http://fulifubajamo.mywebcommunity.org/ketogenic_diet_plan_for_vegetarians.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/safajokugemup.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/2558602097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazomibege.epizy.com/rental_property_inspection_checklist_template.pdfIn PDF document text
    • http://kigigubukedodo.rf.gd/best_audio_technica_mic_for_streaming.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/bovadaketadazotozetepu.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/reaes_dos_alcoois.pdfIn PDF document text
    • http://suloxuboratofa.epizy.com/10323358779.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_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 5704 bytes
SHA-256: d899f510ae3ad0d1491fbd2fdf67940497dcad0c500c007d51439c0b2c3a4de9
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 11368 bytes
SHA-256: 744278739906983e58dce3504bf0a29bd118e8b3c908d71ba96442586ac41d74

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