Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3869e170f441da…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 10:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50ba74f1bdcaefc092085c7d2296aa0c SHA-1: ccbac85f63b63f2263b5443273e70befa2de9278 SHA-256: eb3869e170f441da96db0111fdb3ffb3affac13df504bc90799cd406b497e63c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that function as a link farm, directing users to various download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure for users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=download+art+of+war+3+mod+apk+unlimited+money PDF link annotation
    • https://threadworx.com/thread/admin/uploads/file/40977693722.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/66207935707.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/misuginiluwesaxivape.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/xikabovev.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xaxagukanugeku.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/nijijo.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f1ac066d8e.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vezofik.pdfIn PDF document text
    • http://geoman.cz/data/file/98827680332.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/dazamazezitop.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/34907702865.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/nogevenajol.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/ginuf.pdfIn PDF document text
    • https://mimpishio.com/contents/files/37997773394.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/vusewenalipubaxexor.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/21974421740.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/49156507498.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee547b54c---xozuvewuganibiva.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907192708.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/64882864802.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910044450.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/12701456496.pdfIn PDF document text
    • http://tyextractor.com/d/files/niwitizajaxokumunonunar.pdfIn PDF document text
    • http://salwex.hu/file/55611072824.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378da34b168---barolofoxikozawunabi.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_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 11056 bytes
SHA-256: 88b3708d29b6b15cf843dab572f9784c36d9faf55e52cf8e4b867d1c7dd36e49
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 17876 bytes
SHA-256: 1210a726b71800431163b0c2abb015a76adc1b9eb55fa092e67ae3618823576e

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