Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73d6a65258a4398…

MALICIOUS

PDF

80.9 KB Created: 2021-02-18 21:29:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f73c33ed0d782c18849b98842b895c86 SHA-1: 82e6f7ae9bc412f77f769440626aafcd1bdf5c47 SHA-256: b73d6a65258a4398fed8447c215c5e305ef221807ee042137965ace7a62c7f82
156 Risk Score

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://jacksth.ru/strik?utm_term=what+are+the+best+books+for+7th+graders PDF link annotation
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/8270064.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/ig0hgAp/39169773183.pdfIn PDF document text
    • https://xojakonokixamu.weebly.com/uploads/1/3/1/1/131164577/d647f66.pdfIn PDF document text
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/gijuve.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/f0gcjiv/piano_keyboard_magic_tiles_online.pdfIn PDF document text
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/5957108.pdfIn PDF document text
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/5416118.pdfIn PDF document text
    • https://futuratolofuzup.weebly.com/uploads/1/3/5/3/135399438/9392163.pdfIn PDF document text
    • https://tidekomix.weebly.com/uploads/1/3/4/4/134441433/jumiwaxivisikog.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/gdggSB5/pay_triangle_expressway_toll.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/jbgcoGs/coupon_keeper_app.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/goxaxarutus_genedokuzizini_dunepuvi_wojike.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/pivetuzadujo/sezojaduboteme.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/dodiwelebuvebugabifibite.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/moxuduvowo.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/tzn4s-_14c_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/spanish_speaking_countries_map_worksheet_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 5436 bytes
SHA-256: caee00027a5f5ebafc603432c570a614060df85ec735dff1f645ae8acef4ffb7
font_01_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 10656 bytes
SHA-256: 1f84bc9bd7ecdb06324f7ab563ccc793f0033aaa690a2188d812b27882818856

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