Malicious PDF — malware analysis report

Static analysis result for SHA-256 f137875c7f95a1e8…

MALICIOUS

PDF

85.9 KB Created: 2021-02-22 17:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9026b2c82c9614bcbfd36ae12b2df200 SHA-1: ac8af3442fa43cd517600731b7fdfe1538ae62ad SHA-256: f137875c7f95a1e84bfc43b3154b015177aaf7e208fd457ce24ab2b12847810c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=haynes+manual+jeep+commander PDF link annotation
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/befepopeposo.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/fjdjdoW/wobumuk.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/wisaritimoluturake.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/ifmggbe/37225495170.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/gV2iiVA/49360712378.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/dariwiwarebukiwerali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_602c6c88482bc.pdfIn PDF document text
    • http://hookup153.online/halloween_worksheets_for_1st_gradelumt6.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/MGylxgc/love_quote_broken_heart.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/lufuwekisu.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/uJidXge/bubble_bird_rescue_3.pdfIn PDF document text
    • http://fabermanufacture.ru/pruebas_de_laboratorio_para_cirrosis_hepaticafelke.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/jgvCXkV/music_ride_the_rhythm_games_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/generos_periodisticos_una_definicion_de_reportaje.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/atrial_fibrillation_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/icloud_activation_bypass_tool_v1._4_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/zotidit.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_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 5360 bytes
SHA-256: 378b9d43703b7d583994e3cd8ac045ce4ccc053ac8b555a69be59f495bcafd12
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 15576 bytes
SHA-256: c11e51f8cb08b848b257b2defb5befefcfa9a5c03342fd9f354f0f6dfc69b6e0

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