Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7fbcf02e4b7709…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 17:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43fc1dd321ded00e24582901aaf237c0 SHA-1: 963ec5984e922cec26778333285f3ae957e658da SHA-256: 8c7fbcf02e4b7709b1f34245f8159255e0d31a1cdd8ad228ee8e4589e7324082
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. The presence of many unknown reputation URLs further supports this, indicating a phishing or malware distribution attempt.

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 https://stijsr.com/userfiles/file/zisatexaxopi.pdf In PDF document text
    • http://wannawwannie.pl/userfiles/file/83274547939.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/lofota.pdfIn PDF document text
    • http://maksimetall.ru/files/tavabenazan.pdfIn PDF document text
    • http://badgerhillfarm.uk/zumunifexox.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0bd0c77bb---93548636217.pdfIn PDF document text
    • https://insp.biz/img/file/10269751336.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/47797504733.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/96610184611.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/koleredagixudogutoma.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sadesiruse.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/46998407800.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/38806987829.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/40021880228.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/fusovabetibe.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/gonitimebutowanizozusi.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/55551716645.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/36760508794.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9ki3vml2bb2i72vcpscpqeapt6/54045936114.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/70632981959.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/vemewanetukevome.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/muxale.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/kekopaduse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mod+video+chat+appPDF 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_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 10252 bytes
SHA-256: 1d633cda03310667acf5494828cfc198753dc79eb31256707a11bf00463d50d0
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 17588 bytes
SHA-256: 5c7d4b9bec1d6e5672c3e257676d7fc4f3b7b559f43f2d9c4201b882d5152632
font_02_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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