Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cd7fa69e477a5f…

MALICIOUS

PDF

89.4 KB Created: 2021-09-12 19:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 776a6bfccff8d73dd70176d7161950e8 SHA-1: 0fda387ca6174f6b359e7582af02ba27b977e3d4 SHA-256: c6cd7fa69e477a5f6da10a827ca03a97e0e4812ceb42e90ff354da68087c3ca6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it's designed as a link farm to distribute malicious content or phish users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a deliberate structure for hosting many links on potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://inwebjor.ru/uplcv?utm_term=apps+to+watch+movies+and+series PDF link annotation
    • http://cdkuysuujk.handysociality.com/upload/files/47810661882.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8d539fe7f24ea1f321bfbb593dee2c28/82092154551.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/25453481032.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/11271712804.pdfIn PDF document text
    • http://koala-al.com/d/files/juwadijivakoloripowab.pdfIn PDF document text
    • https://tavio.ru/files/file/82622532019.pdfIn PDF document text
    • https://costarica4d.com/contents/files/fisamosolovapek.pdfIn PDF document text
    • http://mrybalko.ru/files/fuganivasatuwomejo.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109022327297605.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/74573843587.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rademebuvabaxivujor.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/97408233682.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/78129776328.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109041900337115.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906113037751666823.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/30776065256.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/12715127280.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/60592526916.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/mowawitidop.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/xewuwewazateduletikugoji.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020835055866.pdfIn PDF document text
    • https://brs.jo/userfiles/files/bigijilon.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/44172294072.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/34993675164.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 10868 bytes
SHA-256: 918ebadec0806380a89c63dc9cf64ad8789e70a1a1ef71235e66044ff656a464
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 17596 bytes
SHA-256: 9dad199497ac6e5c44afd07365092b7541e73d52446e38c5b37050f1d3e6db95

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