Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde6e6ac60d64203…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 09:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb928d417245d088f4209e89b77f2fc0 SHA-1: 2670275f70f7ef22d7cb0049d8fe32f95a041a24 SHA-256: fde6e6ac60d642033613349596495fb4b8968e776fb859f13abfd9708e094b76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://kondicionery-dolgoprudny.ru/upload_picture/file/82123894529.pdf In PDF document text
    • http://laptopcuhaiphong.vn/upload/files/88133236675.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/17316863891.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/pokekazizorijuderi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/88537629265.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5e575048---98418055681.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/satubawupoko.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/laxojudidedozik.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a846ee7994---66383585420.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/54559293216.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/71380861796.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/lexalewisewuboxose.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kiruligozupopajede.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/21103598160.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/foleziji.pdfIn PDF document text
    • http://klaaswester.nl/img/file/fezuzug.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/monowabiwaziraruwob.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/73987466549.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/57184045489.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/ponom.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/gozumezavu.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/rolusi.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021916225883955.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/50348803731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mi+apps+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_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 16344 bytes
SHA-256: deaea7e14c72d43a5a533f6d6f303856697909c1d6a596d472fcce2d8ef54084
font_01_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 9732 bytes
SHA-256: 89050978674c6fa96c26f43ca4fe25b9370c40940307cbd26225509a896a526c