Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a848f5a3cea4b47…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 04:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c152272def74fc8418a30c0c5747142 SHA-1: 7e5c96405bea102b4d623b0a9b9fc361dcfd03ae SHA-256: 7a848f5a3cea4b479410177d064034fee30c6504b7a4f08bfef400c2f6262e2f
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 embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of techniques used to deliver malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kondicionery-elektrostal.ru/upload_picture/file/nibin.pdf In PDF document text
    • http://enidental.com/userfiles/file/20210904171300.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/89143759185.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021921518351164.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/34508877653.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/18308852890.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/totofe.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/lotexidutodukeselojep.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/87016497782.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/genawonoji.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db8a4e1a33.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/dojejomufawivelebi.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/89079741888.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/77107592838.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/61693946611.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fidiwimogesisupolezivez.pdfIn PDF document text
    • http://xycrusher.com/d/files/nexewilapabapepirurubidu.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13497838740.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/21554363366.pdfIn PDF document text
    • https://foulardfotografando.it/file/31933126897.pdfIn PDF document text
    • http://nessium.net/userfiles/file/73546894558.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f566e10684---radotu.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/kilebal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bnha+season+5+ep+2PDF 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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 10320 bytes
SHA-256: c07277a83816f0e6cee9175450dee82374f68261b13ffb3612f86de3b709b7a1
font_01_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 20568 bytes
SHA-256: 9158459f5676ee1fa69586da47b822cb7efd58321eae52aaa22a55c67ae19319
font_02_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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