Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33a81fb929571a6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 17:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8de91afdeb5792c6d73c6dbbb75f2af2 SHA-1: 6e15d8d4357e9f730a735ce4691be303581b0aa8 SHA-256: a33a81fb929571a61b1ee28d0f3d9ae27346c128769fe4ee241e12d2e094ed91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which points to a link farm structure designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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 http://goraku-sangyo.com/userfiles/file/zilebuwewugovika.pdf In PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/kuwijixo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26561355944.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jezoxesovobiwimikuzub.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/14443964116.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/tozuforifigarajofuxu.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/51036451748.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/belifil.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/22903772101.pdfIn PDF document text
    • http://arsvet.ru/img/upload/siwilazunimevulokogofude.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sopumipefomezen.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/65525332028.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9974bd500---gilab.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/70998098542.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/94112612271.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/47057279986.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/susix.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109060649581827.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gerukewewidubolepolevevu.pdfIn PDF document text
    • https://andhimazhai.com/images/files/50790493865.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/54072999294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=three+letter+words+beginning+with+iPDF 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_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 10556 bytes
SHA-256: 5f16c82c24563d1117637b3c5aceda4c1559d5274e88ffb302571354c86f87f6
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 18808 bytes
SHA-256: e1875575cf09910a2cc7c8495e970d09b29bc1ed5b20e69e30a9ee39c9593063

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