Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ee7b8fc154478e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-24 09:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 51ed5c0b9395ad362fc022c6e6704c50 SHA-1: 0e9a8e1158ba3554830d07902b165533a7c6003e SHA-256: 82ee7b8fc154478e5f5fd2662da0471579eef9af3e729a565dcca313bf29c5e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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 http://onelove.cz/file/dofufufaw.pdf In PDF document text
    • https://kimcert.org/E/file/xugejapekidixumimup.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/mipegatikubigemupuv.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/13585034844.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-24/20210924124725680453.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/57099077143.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/452d92c614468dc6eff9aa204ebe17bb/navabakezenet.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zapalafuritadedo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ac639448fe2957e7d5fb87ac89416603/kolupanisix.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/22500660409.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/55520775013.pdfIn PDF document text
    • https://robodom.si/files_vsebine/23472203028.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/suzez.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/64939927911.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/zunogofepevigul.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/ranufamo.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/5302145378.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/miribox.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/nelapukejisudiruxeke.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/69088708165.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/sedas.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/tibobazesifilow.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wajabesepejufivi.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jatiruka.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/wovijisinexiregot.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/momareruxirutonazomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=techno+gamerz+minecraft+world+download+free+apkPDF 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_off0000c3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DC 18024 bytes
SHA-256: 106537e1248aacf6100705bfc71f4e00d02a66233fc406056317a727ce6374dc
font_01_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 11100 bytes
SHA-256: 2613f484ae9022ef8481a9150a1f12756edac3787ee7529a5330ada9c64b5710