Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9681494c10badd…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 02:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e4f4862ed5c09988f3c8c0200658784 SHA-1: 1c38e323ab8b2a6ba272c7d00f20a71c69a504cc SHA-256: 7b9681494c10badd4cfcae980ba694742d43910ee1227a5a53ea75aab7869101
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and a click-outward action. It contains numerous external URIs, many of which point to disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a downloader or redirector for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://restavratorstvo.com/ckfinder/userfiles/files/30686501404.pdf In PDF document text
    • http://aaaexpressac.com/userfiles/file/lemedamekokagiju.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xewigo.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/lomevefo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/kbfddk219l9o4ucidn3rhf9dj8/rotimagejojisineseb.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/sewutewiziwefagubinusu.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/wunonaxunetojegokax.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/tokulam.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/wowuxoremivezovizajaba.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/wevomodolug.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/78747012018.pdfIn PDF document text
    • http://cnispgroup.com/filespath/files/20210921094848.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/49045514539.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/lazapesekotuse.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309e92be574---38552038445.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/nawemapixixetu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/77005743673.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/27913646655.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/newetepejuluwawuboluku.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mejilejumilisasazofejavus.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632828307.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/rebotopivosoxesix.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/43334217030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=shareit+app+free+download+for+android+mobile+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_off0000ada6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA6 10988 bytes
SHA-256: f5398ae1b65d08991dc4e4bac9574de20b8888fc7faf125ed495be7b8eaf8822
font_01_sfnt_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 14748 bytes
SHA-256: 44c22b742a114d5f8d0b2fa65398be934d58b36cfd09d7a3924745937faa798c
font_02_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1