Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e82361bb8bc8ff…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 07:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8208065bc2faaae700725a2316eff81 SHA-1: 8a35193973d512025b83653d59fd18e06c965675 SHA-256: 58e82361bb8bc8ff405e886e6955919168587911aa7c53d647528f53c73b1f3e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to redirect users to malicious content. The embedded URLs, such as http://jyjwqj.com/uploadfile/file///2021091305504799.pdf, are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://jyjwqj.com/uploadfile/file///2021091305504799.pdf In PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/dabururalesep.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/82878312293.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/toloposiniwis.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/47549401795.pdfIn PDF document text
    • http://e-menu.hu/editor_up/82987671597.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/95108871868.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/8293523954.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wifekenuzulixoninuxuv.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/15109560205.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/306798943.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/45925182261.pdfIn PDF document text
    • http://gazetavk.ru/img/file/xotuzilapafof.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93705292770.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/42384151878.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613936de99db6---xanojibavakisoxeforokixa.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/pamaxedapupejesesofegu.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/98405352935.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/46242940518.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///19919284476.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/dinojixezoxipifabo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/18406301633.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/24750243699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=samurai+2+vengeance+apkPDF 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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 10740 bytes
SHA-256: 3001f81922cfd9e32f668768d8ba4c94fda4563f02b3e4cde265117cb488be76
font_02_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 17196 bytes
SHA-256: 1297e539b790dea45763189ca615f5b9ca3b8d8c1bbad64e72c599ca8c482f14

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