Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c9b44178090af0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 04:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 286ad24b865382ddf90e95020ecb8361 SHA-1: 250a39f0c54f8221bb738440ded5e5b5ec87ea6d SHA-256: 30c9b44178090af04793c1c754de95f5e5cb2f71bcf10ab1944f53377cedb29c
234 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document's content and heuristics strongly suggest a phishing or credential harvesting attack, specifically a 'Recovery secret / private key request' lure. The presence of embedded JavaScript, though not fully analyzed, further supports the potential for malicious execution, likely to facilitate the theft of sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0ad104d8---21232291720.pdf In PDF document text
    • http://studiozammuner.eu/userfiles/files/sulogusowaginep.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/zobogonorijozofir.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/dafogedikavuvesejufu.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/78994349408.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/98774073332.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/kogatodiwamivitutebovevox.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/60518171217.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/titapobirudedafipo.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210910212309739436cnue3v.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/jujitirazipexewekoli.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/79134524488.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/96280741750.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/viwejotu.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/mezeworibikedug.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/26631574018.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/74408596595.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e382890eb5d30db460d376d2ac7247fc/89598856396.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/84079849281.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/xagituxawodi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/92980384071.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/26275135346.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903180947.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210913165454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=react+native+create+keystorePDF 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_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 17552 bytes
SHA-256: f7cf473c50740fa672a9c33755f814058dabe8ff3600a458ffec635c5712768d
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 10492 bytes
SHA-256: 373e8d9d70ffc284b973b9b8db7e516dbcd6b19d07c2b56f5479e4b127bf2b1b

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