Malicious PDF — malware analysis report

Static analysis result for SHA-256 741ef5174d9bdbec…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 16:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4fd679fd27a386a06bec13c00f13567f SHA-1: d342f03d26de8551bce14de9ea35b50b77122772 SHA-256: 741ef5174d9bdbec488f37c7ea04d6b7b8351f9a66a73d01ecb95be740c6726a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://juniorclublivorno.com/sitonews/images_upload/files/18903706905.pdf In PDF document text
    • http://fasson.vip/images/editor/files/dogoso.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/h5uv4or9t5833k2flbk45s7cpr/torupudot.pdfIn PDF document text
    • http://namngonviet.com/user-/files/52030051984.pdfIn PDF document text
    • http://scpt.it/userfiles/files/xodukolozisurupi.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/52049192462.pdfIn PDF document text
    • http://zeci.nl/im/image/nogidanumowakukokop.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/fotow.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/dometetazikuwalubitanazew.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/87548772332.pdfIn PDF document text
    • https://loyd.rs/images/file/dugoxogadabazi.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/41138528891.pdfIn PDF document text
    • https://pellevah.com/upload/files/62392249240.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xudoza.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/34746985682.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/9151510377.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614364da888d7---7417117836.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/72265067951.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/famotukowopetovulered.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210902155334.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/jimerepuxasokarefeb.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210902065324.pdfIn PDF document text
    • http://araratmebel.ru/img/file/45041467093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+scan+wifi+password+qr+code+iphonePDF link annotation
    • 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_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 18064 bytes
SHA-256: 3ddf067025ff87f8afc9c08bf29742222f0a3d6f7ac4683d4a2cf1469d8f0abc
font_02_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10896 bytes
SHA-256: f7739506cdc6515503f1196612e87b8b05e0e075f8a36e761d7672a03fa72bd2

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