Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0bf1c756be8e21…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 17:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d43e1375dc76a18bb10201264ff0807 SHA-1: 2f5c84c0aba69caafa77e1008089b617022592b7 SHA-256: af0bf1c756be8e2169667ffa8dc8f2ee8166c04f4fe77f8f179cdbfeb0fd173f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=procreate+oil+painting+tutorial PDF link annotation
    • https://cdn.sqhk.co/dugelabomaw/er5gfhe/xafubunotuka.pdfIn PDF document text
    • https://gulezawajure.weebly.com/uploads/1/3/1/8/131858287/4769099.pdfIn PDF document text
    • https://firalikagux.weebly.com/uploads/1/3/2/7/132740609/puvazuguv.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/dZxrhih/daily_checklist_template_free.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/f7667aaf1d5.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/NFPji9w/70530925307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366382/normal_5ff1877c7c9fc.pdfIn PDF document text
    • https://padaduzarunum.weebly.com/uploads/1/3/1/1/131164270/52458.pdfIn PDF document text
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/5344308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60172545eb283.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/jopomodilamego/michelin_guide_argentina_restaurants.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/calculate_invested_capital_from_balance_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce12ec6-e4cf-4a11-b7e4-df7c75aa07a4/11489348786.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/bacterial_reproduction_conjugation_transformation_transduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0315dbe3-88f4-4ace-9db7-29d94eaf044e/chamberlain_liftmaster_formula_1_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/pasuzevebususogijap.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/88524405702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7f4f6e-6fb4-429b-8d24-0e3b5c6305d5/what_hand_to_hand_combat_do_the_marines_use.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_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 4924 bytes
SHA-256: 125d0280c241eb0ec15f33cfbab180ebdc28678f777bb86460badabb2838eb90
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10588 bytes
SHA-256: f99061f32033670f79a88f55e7395270ad1a314964a1c57f0662cf7d1e99a482

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