Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d74e084e4e4a2d6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 13:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53e83b782b30abcd568926d31d31b55e SHA-1: d95f9fef13edb618652fe3b502da3baa4696b672 SHA-256: 1d74e084e4e4a2d6217ac347b7db90dcda51f9da91fb88159855d2020c22175d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sochi-riba.ru/ckfinder/userfiles/files/81152833512.pdf In PDF document text
    • https://associazionebriciole.it/public/file/karonovumekevi.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/lijoxode.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_DF15D4F7B211263E.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/logefimol.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9f91dd5e13d83c67f4b6feace7ee208b/61774572252.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/74514086024.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/nikotodozegafazazi.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109140806302221.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/47935181692.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/31673632043.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/31087227412.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/dowupa.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/45087225961.pdfIn PDF document text
    • http://exim5.hu/_user/file/magozemefuve.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/75702950059.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/66140727.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/bewowoludiw.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/fukolajujofe.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109140320116342.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/gatagasurozudotosonuwodet.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/wejer.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nn15sb7432ugm2fikfp2qqqfv7/fagawusufefazekizowari.pdfIn PDF document text
    • http://dd-eng.com/files/files/58755290797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=yt+mp4+downloaderPDF 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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 17936 bytes
SHA-256: d667e7dca43774b176054aafb8ff89778305f887043346452a6983f15234e63e
font_01_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 10440 bytes
SHA-256: 7a064214cbb40fc57e969f66d9f2543fa1faf9c0c4ed91dd0d4aa553a96b0c54