Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a836f8f8669667c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 04:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab820a44c208a4139bd86434f5d2552e SHA-1: 379e7d1cceb57f3eedcaa57b1359e082509d252b SHA-256: 5a836f8f8669667c6d9c62b2dfb2992386f230e0c96c2e136f8e073cc00337b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicative of a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=real+racing+3+9.0 PDF link annotation
    • http://kondicionery-ivanteevka.ru/upload_picture/file/5176529338.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210910075333.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/4324508685.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/16035858555.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/97750249806.pdfIn PDF document text
    • http://yuha.be/_files/file/99533794806.pdfIn PDF document text
    • http://contelex.it/userfiles/files/20368901630.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/30323255220.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210906093743.pdfIn PDF document text
    • http://boldogelet.hu/media/gexidexedomav.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/18671087711.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/wizelolozi.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/direvafefilotudo.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/ponaxax.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa57a66da---jopol.pdfIn PDF document text
    • http://dobermanncz.eu/files/zanalebu.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/95898608750.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/dodeboxogi.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/wazolezulamivum.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/bizabeboj.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5878be24a629e0d73bfab9ac760e3e9c/84258625657.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/417605185613a9e76d9de1.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/webomolujameramopomuse.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/rititipuvupofoseziw.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zurisimexodoxu.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 10592 bytes
SHA-256: 2eeb19e203094caf62804c8c0b32cba644c4d485050984c086b411a2f90a674b
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 19196 bytes
SHA-256: 077ae856b6016e846ec6957141fa3b7d84ac9db7f6a67ee16408fe97edde94e1
font_02_sfnt_off000126fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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