Malicious PDF — malware analysis report

Static analysis result for SHA-256 e471c5b75868464d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-11 08:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88646a298da1d1dd2c097d89d6391fd3 SHA-1: 74c46e5e1037013e89440e89d95191c9a826f2a3 SHA-256: e471c5b75868464d3be0d523eb7858e3ec65afc51c9c3cf8f234bdb9de992666
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific rules like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF acts as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cs-nippon-cp.com/mailmagazine/upload/files/rulesufikoj.pdf In PDF document text
    • http://cleanking.net/userData/board/file/69559312582.pdfIn PDF document text
    • http://perksys.com/userfiles/file/melekifumadazixizamure.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/48075350557.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/80596711544.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/24239265125.pdfIn PDF document text
    • http://grossbuch.com/upload/file/jumixafovebajarefofisuzan.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/81249153911.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/mixodejevowixajapikos.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/69181270050.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/47402079080.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/dibananovurifedefovufab.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/64374372069.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/pavegepojozubenomijizel.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/vubuzogawifinilu.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/ketatiratovobowefulem.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210904140112.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/22562032125.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/87138077302.pdfIn PDF document text
    • https://auto826.com/uploads/files/50473548438.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/vedogakulabosonelede.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/biviwagoladobatadofavopo.pdfIn PDF document text
    • https://eetravel.net/file/gepukevuf.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/totofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+android+app+for+live+sportsPDF 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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 10612 bytes
SHA-256: 84d16c1ec5c289a545cd59fcf7efee10a7269c25b65ebef15e6e2cbd1ec6cbc9
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 17620 bytes
SHA-256: cf469b078828942237fd0eb7c71dcf9061aeac09f6e41d54ea864749bb2726b6

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