Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c1746fd097a9e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 21:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5444639c45f4c0a79098617db603c358 SHA-1: 686765802cae2e37875d3d91a10ad41aed9f6d82 SHA-256: 2c8c1746fd097a9ef31e87af9d56be86dca3b11c2dc61ae0a265be6edbff6637
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 0.9994

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://kuzutuzo.ru/award?keyword=careless+whisper+guitar+sheet+music+pdf PDF link annotation
    • http://fefevulo.22web.org/61175623400.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/iehaKjf/jolotarujogurorebatig.pdfIn PDF document text
    • http://mikenitoxa.22web.org/79116199467.pdfIn PDF document text
    • http://dawinimimari.iblogger.org/89812321025.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/i3Rygce/commercial_bank_of_ethiopia_addis_ababa_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jh1S8ii/transference_definition_nursing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_08650c3b513543089d2c4820c67ee8c8.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_e4d6e402ae6b42928d05bc26ad9f4b9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a73434-aaea-4632-babe-83d80f2ab96d/70142134961.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/gimunama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35b08d9-122e-47c6-b35c-8a1339f8f956/kirabifanavurun.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/gate_electronics_and_communication_book.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_b74b39269e054ad19a4a4e408bd6c2ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/drum_music_sheet_for_samba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5bf9ff-7951-4787-ba59-04b52b9bdac7/how_much_does_being_a_foster_parent_pay.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/agency_fb_font_bold.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/icimod_report_2018.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_0cb0842f467142c2884619b1d38410a4.pdf?index=trueIn PDF document text
    • http://gepaboveron.epizy.com/fewidobu.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/33217517566.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_b6c24c12a7fc43278ee4aa8491901bf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/retaluwitu.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_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 5564 bytes
SHA-256: aaf51a057064528005cd893af848104d62b42f975e60c4c702c27dceb35a4c52
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 10804 bytes
SHA-256: 07aa840658fe3e1aadd29a9de2a4a71e91419ed6e43447b9357bf6545b8148ff

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