Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0fa61036ffe675…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 18:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c588e0dc7d2cc08780bf19359fb1900 SHA-1: eec955315a41605c242e93f55ba9f8d73b11799e SHA-256: de0fa61036ffe675992a0565301264c77e1eba76d14de089530f47a5084e0195
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing sensitive information like private keys or backup codes. Numerous embedded URLs, many pointing to PDF files on unknown domains, suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kolbandibileklik.com/resimler/files/tudanepidig.pdf In PDF document text
    • https://heart-calligraphy.com/uploads/files/202109120720342549.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/labokedemafukikejoluroka.pdfIn PDF document text
    • http://anpharma.net/upload/files/93736408565.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pusajawowegufu.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/gelaxasezefejus.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b000ee4bb8---15143598882.pdfIn PDF document text
    • http://poorclarescork.ie/images/tagubanulevi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8q49tjlhct3upn6fo1p11fdtc7/zidudunobenoz.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nivurubaxofu.pdfIn PDF document text
    • http://contua.org/userfiles/file/80052320367.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/vuvodojaxejewudefir.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/34672403695.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/mufaxosuxerovazimivefu.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/90060335491.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/gafabifumuneginuxivaduri.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/18974924079.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/42428339727.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/21710327581.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/16716638109.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/bosedijerumabozufupu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202192158451822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pfx+certificate+download+androidPDF 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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 17532 bytes
SHA-256: 2471af68a82e62b3efa9568d16c45f810695143b038edd17c36fdb05bda26632
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 10492 bytes
SHA-256: 4c40c81187f8a1c046392bb37cf9bd75f277429fc30c71cf4d9ecd4c8869f2ec

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