Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f336bfce27c4de…

MALICIOUS

PDF

86.5 KB Created: 2021-03-17 05:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d5af809515a507bdbafb4c7d6ba28d7 SHA-1: b6310414833a1cd250473b3544c3123267e8a8b0 SHA-256: e6f336bfce27c4dec6840282e62882a6e1935bc5f9ff3d9ef10dd965edb753c2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=echo+gas+trimmer+srm-225+parts PDF link annotation
    • https://cdn.sqhk.co/zifeduwa/gdBnheU/happy_birthday_cake_for_men.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416319/normal_5feb5c25d7cfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5fcd2764e9869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fca274da125f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_60013a7360f7d.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/UhiSghI/46351998367.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/domumiso.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/6536580.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/hhbrvhh/pewubumonotozugutafiga.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/how_to_get_minecraft_windows_10_edition_for_free_if_you_have_java.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/d1ed2691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_600ef0088f69d.pdfIn PDF document text
    • http://suberubepuparo.getenjoyment.net/46774393066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_5cde26eee4d94eca8c95caa616e02ef3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/pabenisituxil.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/spell_check_excel_protected_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/coraline_sheets_wickes.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/6827766856.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_1136ea46318549eea634fa8b87b1a0d9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 5560 bytes
SHA-256: e7be46efb971ce8dd20bc898ee486172c9042845d82c5eef0a900e4cc38e2ced
font_01_sfnt_off00012903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 10104 bytes
SHA-256: 3bee911630a33a203f7abbed71befe29f47315a11abeb5d303ab0e899deefa0b

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