Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fd4bfe3de99548…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 03:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f353f0bd9f8e60290bb0d8ad70be885 SHA-1: b48493a15dc50408c39b2dbf14786107108ce622 SHA-256: 07fd4bfe3de99548853f922ee9f9798dff058e3a97064324e07aa686e1eeae94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or a lure to phishing/malware sites. The PDF structure and embedded content, while not directly readable as a coherent document, are consistent with attempts to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=how+to+make+a+chat+app+in+sketchware PDF link annotation
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/kazoxugesiboronagaxesemov.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/47204803019.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/86965958685.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/10be5c2a7b63b4c9e50b8162f85088ec/devulikanidumuni.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/xibegosazijagadudezise.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021092709454170554.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/salisajan.pdfIn PDF document text
    • https://mkontroll.hu/File/6380736383.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_ED0F0A9C9FE8B7EC.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/1085314575.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/mexasemenijen.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130afabb2758---rezawubevaw.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/wofug.pdfIn PDF document text
    • https://thehouseproduction.net/file/fewejawaguf.pdfIn PDF document text
    • http://stonebreaker.at/90434204672.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/57069048343.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/1282745284.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/90296001328.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/rokifenomusige.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/68617888668.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/tapabotutevabusifolulux.pdfIn PDF document text
    • http://maidichike.com/upload/files/82068507542.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912073120.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/61006519261.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/52635940422.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_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 15856 bytes
SHA-256: 803b0a4069bbe614a260ccc9650d5679c87123c43578c3bcc63b128bd3604c39
font_01_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 10760 bytes
SHA-256: 3cc42e9fc33d7dd7e9fd40b4c6aaba6c1f465bb2e1ea2519ade498237c8a4dc2
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1