Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6fc520c99d8dd5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-08 16:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 419ccba2191a080aa79043b2a41b604d SHA-1: 8aa10af476872a20d8e1fee1269ab5cdc274c4a8 SHA-256: 9f6fc520c99d8dd501e27669d8cbfed84100cf14e9db2b110259568285d82570
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, suggesting a redirection mechanism to host further malicious content. The presence of external URIs and the link farm heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://mastervin.ru/files/file/pilunosete.pdf In PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/juwil.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nisupirumesukujewika.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/67940587553.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/14351094770.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/13978982104.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/27789785578.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/40717681885.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/6798575600.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/bawaxifeda.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/tobanifuzafokizazinufegu.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/6551862345.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/mifepudetitumemapagujilab.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/40694544845.pdfIn PDF document text
    • http://santeh.md/img/files/7837571370.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613879c0c6a5e---vimodonisizenitujud.pdfIn PDF document text
    • https://architektor.ru/uploads/file/wabonofedupake.pdfIn PDF document text
    • https://adikkedua.com/contents/files/nasetudujijataxilefalar.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/31597517731.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/fagafoteluzixajeti.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/pusegav.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/wezokitoluvezufogese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=importance+of+comparative+education+to+a+teacher-pdfPDF 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_off0000bcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFF 16732 bytes
SHA-256: 0d9397bc74fd1508a848d9935b4fc8f2ccf3ff737f491b4cb43bd286dde9b8b0
font_01_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 10820 bytes
SHA-256: 6edf98ac8e50dd0584e9eab011b6988be77c2a1f23c78c93b93fc709c5416821