Malicious PDF — malware analysis report

Static analysis result for SHA-256 de437e1a7c82916f…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 18:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8252b1589d9b8686ba3c6c1310f121a6 SHA-1: 7013eacf88ca0a6f8d01a0261e19d226e805cb8f SHA-256: de437e1a7c82916f275966f2a30ba6acbafe233a4dc6e088394d04478b6ba80d
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of 'LOLBin token sequence in document text' suggests attempts to disguise malicious commands or URLs within the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infiniti.e-library.tw/uploads/files/jebotigomupozufazo.pdf In PDF document text
    • http://www.scsk12.org/policy/files/files/80012796364.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/zifolanebosofabo.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/mulufu.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/bubomap.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/39336702991.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/lunamumovilufulez.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/31369261335.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/4826457526.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3619828a---2522800979.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/zamam.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/30789071268.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/juvekonetorejexa.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/48584214964.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/pirogim.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/79908020087.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/vupadodanebadijuke.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-25/20210925144359683053.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210922_78570836EEB2F3C6.pdfIn macro / runtime command snippet
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec7a11e22d7785a5f32564c77d46c4a2/vuzerodeworejapibuwibike.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wejuzagipufel.pdfIn PDF document text
    • http://sga.cc/uploadfile/file///2021092706353120.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/84815696429.pdfIn PDF document text
    • http://anhuifanIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fifa+14+legacy+edition+psp+isoPDF 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_off0000add0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 10916 bytes
SHA-256: 36ed73f7ebb95c5eb123d1f9cb5f8a3f3a21f4d5949a34e24bec61bbe7132f62
font_02_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 14488 bytes
SHA-256: 4d88964319f948c7481e1e7e06b382cb51105619cba77c8f4c845b75173c60ec

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