Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55dbc5677b64bfd…

MALICIOUS

PDF

98.9 KB Created: 2021-09-20 21:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3229e5337ca3de53a2a9a998c7598857 SHA-1: 07eff2f9223ab77d3e6915c88d5a2134644a184c SHA-256: f55dbc5677b64bfdcac3b630095960b6e08d85de785bee4e484463dd99c23d50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=plantillas+papercraft+pdf PDF link annotation
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/47838886988.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/1039128711.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/99151475070.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/tumobelugafefed.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/penowero.pdfIn PDF document text
    • http://lovesenergy.nl/file/49852335116.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/ziwevabejuvarazadejepa.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/jeretoxofupupa.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/jatupudatojal.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/33381622232.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/59647764417.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/38591499684.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210904115538.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/62854582026.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/77349410861.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///4105256280.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/79627401345.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/883066c299d1289a609d2cb2e5b4a4ae/lumorodikaduwuvatowesunun.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/32732974500.pdfIn PDF document text
    • https://dukupahit.com/contents/files/famimibivijinusik.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d5162500---50504910885.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/vumironumejodavareted.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gumizijexujapofet.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/gilumipesolagafusajapi.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/12038323864.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/24641254556.pdfIn PDF document text
    • 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_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 10492 bytes
SHA-256: 75343ab97d32b9f889681891e40f9b7ddb356b9ea83f44b635f22b630e9fc742
font_01_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 21128 bytes
SHA-256: 17bd95beb81227fdbb9858d56c8fc8c51f4f3fe3749c9b0da4d1bcd3a2e371bd
font_02_sfnt_off00016598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1