Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dd03b878ca7892…

MALICIOUS

PDF

71.8 KB Created: 2020-12-22 17:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b07b0075e1d72a3bd58d9f4af7395870 SHA-1: 9950b5011b4aa79a9c45d3c62389caa2f55749ff SHA-256: d5dd03b878ca7892236834a8373c6d5696c93ce7a0c719d70b49842981ed86f9
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('trafffi.ru') that is likely part of a phishing or malicious content distribution scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=voice+changer+vst+fl+studio PDF link annotation
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/7497950.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/3776894.pdfIn PDF document text
    • https://lepujipalojim.weebly.com/uploads/1/3/4/5/134599636/nibofafanozig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc3963c12facd59cebdd614/t/5fc5c745fa04221c71e89982/1606797130767/stories_of_ourselves_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/tefabexelotudifejavojubab.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/42151366458.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/concrete_technology_objective_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/68857157319.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/showbox_apk_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644c936e-44f9-4cf1-aefd-ed7db1dc1452/vidilivarazexop.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/10246563287.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 5308 bytes
SHA-256: 8206bb588fde8fdaf99d372f0371d3f40d41a7eebc64b1ad7a696352c212a04f
font_01_sfnt_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 11068 bytes
SHA-256: 1c5924e3fb50f61d800cf93bf04ee8bdf9d173be616b2d88506b86ca5a4b9f01

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