Malicious PDF — malware analysis report

Static analysis result for SHA-256 4937c32bcd78d4c2…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 00:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 535f55fca31f7d7b0965e30391f80456 SHA-1: 9c00198b7979a8739938a95c0d95bdd9b321613e SHA-256: 4937c32bcd78d4c20e1712726d9316afaf660461f9880b4c12f3910643dbb8cf
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 0.9997

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://botokaw.ru/wix?keyword=adguard+3.4.120+mod+apk PDF link annotation
    • http://rugozuravonabib.22web.org/antonio_gramsci_intellectuals_and_hegemony.pdfIn PDF document text
    • http://xubozogafajus.22web.org/kobukon.pdfIn PDF document text
    • http://nujuxogo.iblogger.org/70164044388.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/blink_182_i_miss_you_karaoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujiruwer.rf.gd/podusokuwed.pdfIn PDF document text
    • http://joluvuworizuv.rf.gd/board_game_rulebook.pdfIn PDF document text
    • http://titasukutisun.epizy.com/xanizoxinavox.pdfIn PDF document text
    • http://momerulazem.rf.gd/additional_mathematics_syllabus.pdfIn PDF document text
    • http://lorovaxejavagu.rf.gd/vodezo.pdfIn PDF document text
    • http://niwuganol.epizy.com/22116319102.pdfIn PDF document text
    • http://mijogivuxob.epizy.com/inlay_cavity_preparation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff2bbb0-71ec-4b84-bf66-5a8b3e22ddb0/62056010659.pdfIn PDF document text
    • http://kitefifu.epizy.com/pumopebimikajejorebob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b946ce-ed32-41a9-a59e-27eb0c1e95f8/refotalopajuzima.pdfIn PDF document text
    • http://tumapaluk.rf.gd/convert_to_jpg_adobe_photoshop.pdfIn PDF document text
    • http://denefarow.rf.gd/bill_of_rights_worksheet_high_school.pdfIn PDF document text
    • http://tilawiveso.rf.gd/mixtures_and_alligations_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ceeb372-a2a6-4807-a611-b5018e7fc93c/14890521376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efca6c93-139e-4673-9b72-ba2cc45aa2fe/how_to_write_a_pitch_for_a_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbdd29b4-daa5-42bf-9625-ac8198fe665f/someone_like_you_piano_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b83c90-cff9-4170-8648-12882623535f/the_champions_mind_by_jim_afremow.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_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 5732 bytes
SHA-256: acbba710293af8bb1465d73826fbadd36f723dbbaadcfb05532a1c07618834c1
font_01_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 11620 bytes
SHA-256: a7fcd62b3cb68777f20c18cb90ff235da6569439c3f873b2d228214baf6c4acb

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