Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dfcbc6c668118a…

MALICIOUS

PDF

89.9 KB Created: 2021-09-23 01:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9e214d4a0b48c4187cae63e9204a0d8 SHA-1: 9ba367fb0604a74487132a7d58bc48dc6fb3da2b SHA-256: 94dfcbc6c668118a0a83d39341153cab191a8695a52660591dbc0e9e4aa5ba83
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous disposable URLs, suggesting a phishing or credential harvesting attempt. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://itscebu.com/upload/file/20210913051958.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/sirabeveka.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/paxoginazipupaxu.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/meluputujipu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/45509107324.pdfIn PDF document text
    • http://cobmedia.hu/include/vemap.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/41415487931.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dipoputuxuwo.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/nesapakojeloba.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/26239101328.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/rujax.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/svqvvisb56obknkqmmbckjb1g7/53046328398.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/93755176841.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/xufubipijisevog.pdfIn PDF document text
    • http://vizcsap.hu/files/file/39192363650.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/51353196118.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa8c56d843f71b4700b833fb95dc273f/xaleraruwofadexiravup.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/28881441742.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/74406119648.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/81807116428.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210913005133170.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/24978732270.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/79122567482.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/fubomibudap.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/topukakowufogotewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+password+patternPDF 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_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 10408 bytes
SHA-256: dcd419a2f561630bdbc2db90f9ae59f3a7fff1fbaf04c18a1e0585b26ee1a7c9
font_02_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 18716 bytes
SHA-256: c91f86ad4c1f515b98b32bbb6b5b6915b187b42911a6c5649c8a7aa5e211b990