Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e0b51118789541…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 16:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb78c92ce3646e963411dbf15a5f0797 SHA-1: 0d22b2db3b16217bf0f67500a2a1a0a3ef0a5fa3 SHA-256: 07e0b5111878954103f043aad38fe12c759617a3ef2562a7ce5211777c4204ae
134 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://auditorescr.com/ckfinder/userfiles/files/26884707099.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6c9ea81a---nidakipaxipelonejejiku.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/121285892.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/zojofidinitoloreditos.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/94606852093.pdfIn PDF document text
    • https://network-italia.com/file/momexoxusadivo.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16308972361242182949.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dumevuj.pdfIn PDF document text
    • http://axwelindia.com/uploads/gagageveziwajisize.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/96922180349.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/80165093558.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/tiwane.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/94370802758.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/gulaludezoxovatefol.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/93675932970.pdfIn PDF document text
    • http://kalikraft.com/images/file/37010809760.pdfIn PDF document text
    • http://darec.sk/files/files/kedokevumobuxofov.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/masebaduw.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/lixedariraju.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/3263747214.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/gesoligaverinizuziku.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/580639e8352fdbd949820a1a696c3576/wutizev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=types+of+internet+advertising+pdfPDF 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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 10768 bytes
SHA-256: b1c2af5cae22d52387c720b40661effe61f1952590cd14bb51dc7f529d68be19
font_02_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 17932 bytes
SHA-256: ff00b9c9384f436b0eeaa70c7db11f9b3fbf75f4bee5fe07d496200bb00173e6

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