Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb93a8a5ebf016e8…

MALICIOUS

PDF

70.8 KB Created: 2021-03-24 01:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9331a06f2361fc8417ed396e611ca3be SHA-1: 6847de39ad4b1171ecf38f28b618797165ba4242 SHA-256: cb93a8a5ebf016e8b646db99235dae29e313941bbb651460aa39fbaa80ac5dcf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to PDF creation, and the presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=medicine+practical+book+pdf+alagappan PDF link annotation
    • http://gapagal.mywebcommunity.org/zaxopokewitorijevivota.pdfIn PDF document text
    • https://cdn.sqhk.co/vevajewez/fhjhgjP/cnc_motorsports_brighton_michigan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fee805b99ccd.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/dior_forever_skin_glow_2w_review.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/zalolawidaratano.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/dBIgfja/hitman_go_ps4_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5ffc3a10bdb70.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/UYjfjag/48293902927.pdfIn PDF document text
    • http://nuxirofa.iblogger.org/29775827980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_652cb79804c145cc8c20176a9618f1bc.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_d509e38ff52643d9a1fbf452b19d4f2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c79832d-5748-4a21-8b48-30d0ffa3e313/72668381436.pdfIn PDF document text
    • http://wareguw.atwebpages.com/sedavizarumefubij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4ffb4b-611a-409f-9d22-c2137e9f05c9/kaxukugadizaritelojuguki.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_9cc96a3cea314b10a31f871507f147b3.pdf?index=trueIn PDF document text
    • http://zuxorijafofonal.rf.gd/pejimifiwotelasaro.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_444d113f4ffc483ba74fa8ffcff58a1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ed9308-3b1f-4970-ad14-f62db21cb1b0/94687416565.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_321f3865185c4140a0bba1230ab9f98e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 5144 bytes
SHA-256: a442415a045033d6a19c9fc7f9e35d4e177697d5689d5fc95b38a0402e5d6fbd
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 9488 bytes
SHA-256: ced5a28215d8686a4ba6d7ea333e0d83cd76cf0a548448799502cca3d6f77dff
font_02_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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