Malicious PDF — malware analysis report

Static analysis result for SHA-256 f774736280078543…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 13:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0eedbef3f1db44b85e1b44b1917d4b02 SHA-1: e55fbd7f65eaf04f3dcdadda8d6862aaf0baac09 SHA-256: f774736280078543ef0e60e26b8502af7b2277c1c2dd9b991f9b4f86b5bea803
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful 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://drafthe.ru/uplcv?utm_term=best+2d+fighting+games+for+android PDF link annotation
    • http://maristaslardero.es/userfiles/file/sosireledavazosevelim.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/16237197150.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/kijerufutebadiduxade.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630973490.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d45bb5d9f8---95683707806.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/velimaxarabokugumabe.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/jenezog.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/xanowe.pdfIn PDF document text
    • http://rotang.net/userfiles/file/40448464107.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/22737027380.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/ruramojolakotapiwowiguzaj.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/kifejokabakelapupot.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/56655067057.pdfIn PDF document text
    • https://aromamarketing.md/img/files/zogizusuzofuxabi.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/31484935711.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/11654869848.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/pevebivasekoresakid.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/nituxobibuvef.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/99852287526.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/36199241253.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/muwatejamodemonarasijid.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/vupesu.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/tifepupiwasuwakiro.pdfIn PDF document text
    • https://lapdonline.org/file/sapesewedigufevemuvexovo.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_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 17172 bytes
SHA-256: ef8e09f0a2883e5e9030c4a50155b8048cfbb5c4a0dab8688fc44b1b01dbfc58
font_01_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 10928 bytes
SHA-256: 4b13b3216d6221ac71b644a204629c6e991b83ee2d52eeb33be800cfcc47a19b
font_02_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1