Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d8398e5a66ade8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 03:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b89b6762692e150e320aa5a24951768 SHA-1: 484c10822fc11a1951aec84dd190ef2015783e16 SHA-256: 28d8398e5a66ade88d547b3113d120b00d66e1606ed2c5b4d52fd0e95d11da69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm, suggesting it's used to redirect users to phishing or malware sites. The PDF structure and embedded content are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://superpart.com/files/lagifenusixe.pdf In PDF document text
    • http://belgium-ex.com/images/blog/file/setivejezeg.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/porewimo.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/98743201487.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/82983472787.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/zosisodolaju.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/99439651905.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/98132535565.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/53872379554.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/gafowexizebiwizedeli.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/ruludamisatopasuzubudo.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/bivemanetebazufe.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/dodanidetusug.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dujafelibuxexugodalove.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/lidokasix.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/suwofen.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/buluwufo.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/12633255198.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9e778d5fea11b38dfd70abefea990d47/sizog.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/13831732131.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cbd9374f---57371634669.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/giteme.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/67939122565.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/xemofuma.pdfIn PDF document text
    • http://ahchala.com/img/file/52294340207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=similar+apps+to+play+storePDF 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_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 10500 bytes
SHA-256: 3e9193080ad274c5e9ef81210e713d37a7ab887b0b2ce6980f1470c4d7fd9bd8
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 16996 bytes
SHA-256: 0e632c56333fdeb3eb6d789fd4e26b01dbc24541618770e35f8806af419bba56
font_02_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1