Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e55c688fa1feb0…

MALICIOUS

PDF

94.4 KB Created: 2021-09-09 23:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c684a366aacebf5c3c553de312281f96 SHA-1: 7c8a73e359cd624bb366ea2267c6d7c9977eb609 SHA-256: b4e55c688fa1feb03864fb2d15d2a85f62007a6e72494357db31f4afc38e6e4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mamolenasnc.it/userfiles/files/zenudi.pdf In PDF document text
    • https://carlojans.com/cms/file/patodojutitutolet.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/vizevimoweva.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/mefosunafimufufotofulam.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/8197261190.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903051155.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/fajedis.pdfIn PDF document text
    • https://actorconseil.com/files/file/tavuzatosogibofudumaj.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/92593906657.pdfIn PDF document text
    • https://digicpictures.com/downloads/11126794367.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/setopitolakosumekad.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/zujonuzixujak.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/her739k0eb9k2f7v7jt8qf2pbi/11882267782.pdfIn PDF document text
    • https://ienter.bg/files/fuvebaroxepi.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/39824062083.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/vawelezekiwe.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/78434426763.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310724f3021---30751057512.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/ragetepose.pdfIn PDF document text
    • http://futboltotal.net/images/files/25825556808.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/vunetanoxuvepemopokonul.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/mujadujugefutereva.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/tolupelerenos.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/90651663768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=make+a+video+your+lock+screenPDF 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_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 10628 bytes
SHA-256: a23b9c2dd453109ea423564977d6bbf747ed3c2a747bdaa7ce6cb8c5b33e2156
font_01_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 17688 bytes
SHA-256: af3288a9d1cc2d68927ed5a09be580b7ec178f6c340e27156aff1a6b290302bd
font_02_sfnt_off000153cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1