Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58c01359065bee4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 14:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7668f336169955937c77a935fe9fd9b6 SHA-1: 7af7a366e419b610ddfa2ca4ad855c94e231e1a8 SHA-256: b58c01359065bee42ae21e61b4593d698b21e531763cd89c90529cdc2e11ff04
166 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, specifically a browser extension installation lure, to trick users into compromising their systems. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download and execute a malicious payload, likely involving JavaScript exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://lt101shop.com/userfiles/files/pedunum.pdf In PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/zimavovig.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/poxolijejakolebes.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/jibawobaxati.pdfIn PDF document text
    • https://agros.net/uploads/file/42776910126.pdfIn PDF document text
    • https://etadelloro.it/images/file/vepokorotimi.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///44370743707.pdfIn PDF document text
    • http://btfa.tw/upload/files/12352720962.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/55863530282.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/45039188345.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/20480501613.pdfIn PDF document text
    • http://artepcb.com/upload/files/zawoganajasovojodu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16310242651976131256.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/93178994818.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/litoruf.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/12676296986.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/15528679652.pdfIn PDF document text
    • http://zzquansu.cn/d/files/mulidetatujomero.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/1844531966.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/62111902388.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/dorunabudodokazafugawub.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/61493167091.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/bafewawik.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/20961130383.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/gilixepixuvufofebaji.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/slcqhlpkqokch9l121pqf56gl0/54011658268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=web+translate+chromePDF 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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 16980 bytes
SHA-256: d16ca50f645228c336e196d86ab625e451ae1d9a21b8435d7a570e57fe6e0651
font_02_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 10536 bytes
SHA-256: 32372f754a9f414a48254420539990e85b6d4e0afa05b1ad214acbf6a7ca0a67