Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4a33197b436496…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 21:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae7ff543eef8449c0fbf4a16022f7e6f SHA-1: b56e863fe510ddb1ef101b18f1271144fc307556 SHA-256: 3b4a33197b43649697cf34cce92e29849108a8ffae8c8f6f49f87abcfee16497
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading an encrypted payload, likely for further exploitation. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=metasploit+penetration+testing+guide PDF link annotation
    • http://kramor.bg/userfiles/file/kizuvuvifimibesuziwe.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/93615407690.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614040e575829---nibabixed.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913023056.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zipevanixikerenadepunaso.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/68469896208.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/96351676172.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/5215176481.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/tizogowun.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/kuxitepobevafin.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/zavafurut.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/26059208263.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/64452099470.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/56204881585.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109132032397165.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/37314456374.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/bedesuvabunibopaxiwuduta.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/zubuku.pdfIn PDF document text
    • https://kaimano.it/file/39511759575.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d410d5f150---puwinemojenatugonubawepu.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/mibiweselugifati.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/91720504143.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/vewovipofukewesujejaxifo.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/gogenewawuboxu.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/nebovutitofupijonaxuroxa.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_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 17760 bytes
SHA-256: a0543603581565ae776eae452975579640dcb2f631d393dd3d7eaa056a0a3d0d
font_01_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 10660 bytes
SHA-256: 9f424174e86375eab40731dba06ad64ef30dd82d16f16f406b5100c7f5ec3280