Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fe6f9bee6a3969…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 19:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05802d44bdaf97308bb9664ead19ab6d SHA-1: 6915400c3117b55fd9ffa3e5c1851ed5f938a0ec SHA-256: 71fe6f9bee6a39692229cbe434fb4dfff0b675eb6c0fe5197f7607c34dc87afa
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. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are characteristic of a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://chcial.ru/uplcv?utm_term=android+phone+clock+display PDF link annotation
    • http://orchid-daikanyama.com/userfiles/file/tumobagazi.pdfIn PDF document text
    • https://branches.armz.ru/media/File/denapisutiferupugux.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xefiliribimiwavibanan.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/48004748749.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/ragijabid.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/wavamejasupuxofizax.pdfIn PDF document text
    • http://bastola.org/userfiles/file/5653597124.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109062032317361.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/47450900940.pdfIn PDF document text
    • http://idevoz.rs/files/60938661259.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/31748936369.pdfIn PDF document text
    • https://videoeffect.ir/data/file/menizuman.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/zilomixev.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/49745114893.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/matilerokutuluzezozive.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ba85eaac---62732161103.pdfIn PDF document text
    • https://ismart99.net/upload/files/robojukulimoxub.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/80981437345.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/36147450759.pdfIn PDF document text
    • https://shidoremicrosys.com/media/42201710584.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nuvutobo.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/32813245302.pdfIn PDF document text
    • https://birotex.rs/images/files/dozijexezexok.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/kopalaf.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_off0000ae0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC620 14424 bytes
SHA-256: 4d1f8ec1a58b6f8e15bf65f30d25ed0a236f421d59a732b3b9889f75c6ac6a49
font_02_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10700 bytes
SHA-256: 7676e82790cd3db5bb34dbcc51406f654602c17fe7f63a7bfc05be99e872e546