Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4b4c63cfc25f67…

MALICIOUS

PDF

74.4 KB Created: 2021-03-29 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 206386c446d0fa2d151952498e5ef869 SHA-1: 5bc34dfc933df51b37d16bda06f402e8cf3b8607 SHA-256: 5d4b4c63cfc25f67f1d6bdb9ecc78a66a8f4c692010e48c1be2d60227b929874
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 0.9996

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://xezojetit.ru/123?utm_term=tool+answering+machine+song PDF link annotation
    • http://zixivudu.getenjoyment.net/wititinojavel.pdfIn PDF document text
    • http://ziguzuxudatigu.22web.org/basic_gates_digital_electronics.pdfIn PDF document text
    • http://small-italy.space/tuba_buyukustun_new_seriesa5u4k.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/e8239c6910f.pdfIn PDF document text
    • http://itverys.space/nadufuwamapukosadizessa78u.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/kefog.pdfIn PDF document text
    • http://webdefilmizle.com/537594931967b6lh.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/sonic_nutrition_guide.pdfIn PDF document text
    • http://rastet-malysh.ru/boteruvoboxoxapajq6fm.pdfIn PDF document text
    • http://jezuxomanitabi.22web.org/japudifibofufomulakuwek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9749dec9-56ba-4554-876f-b74ae2558f8c/ratazelasakagarusa.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/rapapinepisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b83e69a-51f8-4831-b782-3fe7cd89068b/foxisubekanegiwosoxuwe.pdfIn PDF document text
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_3de241326e7d454781d425aee8db7ecd.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_7308458564044b2e90e30b3ee64c6cff.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_ad06d6202bf946b891be19698fa259fa.pdf?index=trueIn PDF document text
    • http://mutoris.rf.gd/mikedej.pdfIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_16b0a3562c0a4e2aac0216e9c764af61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecea3c98-26ab-4270-a3aa-d9a0e2c5e461/jadilab.pdfIn PDF document text
    • http://lopafulobitap.atwebpages.com/classroom_management_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7330a496-0a9b-4c69-a327-2d930205b682/70964012544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf1ee1d-b2e9-459c-930e-c95a2fda8498/bojelupekukakiturigowo.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 5252 bytes
SHA-256: 0d4a2c08a10070a67524a578da115b084827255be2aeeadbdf96d6df76afe431
font_01_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 10744 bytes
SHA-256: a3099a6e363787a6a1f17b289ebcada1a0518764bcb5ff434ea97f2a0d34bb4c

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