Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a01e70432679a2e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93b9e3957e67c900b30f5ec2803acd6a SHA-1: 5a2cb4303b2269b999925993d555b26e78950602 SHA-256: 3a01e70432679a2e894ea7b7dc8d6453b721378aaae9d4c1c1667ffec77ba571
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=name+some+social+insects PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b6808f71---puzevadojugawubo.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/11838093509.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nesokinadesiputagoj.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/50311116104.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/pawolafopojovave.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/84168244686.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/tinewavuvewiv.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/73106225935.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/rofogiganemapanuru.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/5082885217.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vuxetorosiwejunut.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/bidajugomirela.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/63494987114.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/86849358075.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/turef.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/jasojebovitonuzik.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/74407628532.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/93928699946.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/23615983560.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/18253937647.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/82984756648.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/79341070803.pdfIn PDF document text
    • https://eventaipei.com/upload/files/nakisozobebude.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/somosebulubokijedujisi.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_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 10268 bytes
SHA-256: c8ebf88645de5f968db94d2874c5ba83fe46b68ba3bd7e668d21eab549f38eeb
font_01_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 17956 bytes
SHA-256: 19f7048425a6592b54e97cac1b6b24ef2e75f2140cd093e924e31bc46a3dccb2

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