Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d8cb63101af071…

MALICIOUS

PDF

92.2 KB Created: 2021-04-15 00:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e22969e4158acc19b6eece9acfdf1f74 SHA-1: 590a80a060b759c4cd691b1e994bd863f191cca6 SHA-256: c3d8cb63101af0716d1b17795d822f03dbcac3e84692da0325935c0a9d5c4227
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://mezovuduw.ru/strik?utm_term=stihl+ms+250+carburetor+adjustment PDF link annotation
    • http://terugate.mypressonline.com/personality_traits_adjectives.pdfIn PDF document text
    • http://suwadebizon.mywebcommunity.org/carbohydrates_classification_and_general_properties.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/advanced_players_guide_pathfinder.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/fobitewezavabozipome.pdfIn PDF document text
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/6014070.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/toro_recycler_22_190cc_oil_capacity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mixezized.myartsonline.com/banking_current_affairs_2020_june_banking_awareness.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/43220501396.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/whatsapp_status_songs_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/53022394884.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/zofafeduju.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_d6d666a7a24c4e4c9bf276cf2f9a4a3d.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_02fce076f21a4c5a946eb0a657520763.pdf?index=trueIn PDF document text
    • http://weparaxopulo.atwebpages.com/juwufewoxopapexisudaniti.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/what_kind_of_oil_for_worx_electric_chainsaw.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_59c4768901ea4a2c9383f2ff98ccd355.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51870b2-ba79-4b2c-929b-d021bc01d331/ms_excel_formulas_for_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/troy_bilt_pony_riding_mower_spark_plug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a1c595-0a1a-4804-9942-1af76af4e1a4/89118789969.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_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 5896 bytes
SHA-256: aa1a3141b8cb66972d555b601bb64a8c1fb3bc950d42670cd96eb715b75e308c
font_01_sfnt_off00013cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 11452 bytes
SHA-256: 243c8790da8849da76b0e1a9a645f9ac48b65f4443badb81416887df4f7e02cf

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