Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cb8ae5b8c3c5f6…

MALICIOUS

PDF

105.0 KB Created: 2021-03-10 06:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 587fa648e4f1239aeae4e32a2ee770ca SHA-1: 9cd6b0174bfdd983601742d18f23784fdc849eb0 SHA-256: b1cb8ae5b8c3c5f6dc9934c006d384dede8cfe468cea1ad0ea3861d5f5a40af9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://zajinet.ru/wix?keyword=deutsch+aktuell+1+workbook+answer+key+kapitel+11 PDF link annotation
    • http://nejevefivi.mypressonline.com/fiporam.pdfIn PDF document text
    • http://lagefimuzupu.22web.org/datewarutilaritipire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5fe090d141ddb.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/87408283144.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/are_bmw_expensive_to_service.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/26796898631.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/wakomuluxituxuwojoravad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5ff574f43c1c3.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/79182701552.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/jpmorgan_chase_bank_court_orders_and_levies_department.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/2883408193.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/washington_wizards_players_2018.pdfIn PDF document text
    • http://voxanasu.22web.org/apeman_camera_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ff09e3f03e97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_a1eae2220ce74eb2af66025a1e2c8e85.pdf?index=trueIn PDF document text
    • http://pusujefizu.rf.gd/5074106854.pdfIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_f173055f66134ad3ac5e418e85c41e1a.pdf?index=trueIn PDF document text
    • http://jofijegisa.atwebpages.com/30644862176.pdfIn PDF document text
    • http://timivaferegigor.rf.gd/latenazisuvufik.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_054b3c974083460b881f52391254f669.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_4602c3f9825a418ba8b8b0f20ba7c26a.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_8cf0f030d6294a49b83a7449441f9779.pdf?index=trueIn PDF document text
    • http://kagijido.myartsonline.com/ikea_malm_double_bed_white_with_drawers.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_off00015c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1B 5472 bytes
SHA-256: cbcb15b9e06020ded14946a1d29d8ed53e469d2d31d1b377a3d290b79dc22160
font_01_sfnt_off00016ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED0 10852 bytes
SHA-256: 0071ed692590bcf9d8abb7de791faf3e7b7e322d34e754ad5f289305a9178a42

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