Malicious PDF — malware analysis report

Static analysis result for SHA-256 73df1414df3029ac…

MALICIOUS

PDF

81.6 KB Created: 2021-03-22 15:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1ebd7063a1d317205a0f8edeec39f37b SHA-1: 59365fd4fc71fc04993f2ac6e55c29d99e474c26 SHA-256: 73df1414df3029acc609a90359a256789c6c09aaa577c5c103e657d81be84632
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://golowaki.ru/wix?keyword=right+triangle+trig+review+worksheet PDF link annotation
    • http://betijeduw.getenjoyment.net/73459269078.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/dapobo.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/73065719965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_603facd46f7e7.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/109a9d176657a.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/xumeseruf.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/juzulolapidivusoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600a426756d38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/airtel_tv_live_app_apk.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_bb27bbe507dc4c85b81c3e23962c0fb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukujidor/how_to_start_life_coaching_business_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/police_report_wallet.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_9f80a9e14d8449759b6bb2fad6a3599e.pdf?index=trueIn PDF document text
    • http://bodegifu.atwebpages.com/how_to_replace_lost_license_plate_massachusetts.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/basic_electronics_engineering_nptel.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/yo_whatsapp_6._72_apk_latest_version.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_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 5168 bytes
SHA-256: 962fcfa3261ce1a7cad3bf0c61f4893a102e7003e9c74dbd18306c3dc9dad280
font_01_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 11236 bytes
SHA-256: 28de555c58ef8d6e57ec138fca8b09c85ae4ea049db1f483bd768bacc589d917

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