Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6ff213fb12167b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 21:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af6ba071c755987bbf07f5c4c40d5106 SHA-1: b63e018c83957cca10caa6375b4ad60df21a01c9 SHA-256: 3d6ff213fb12167b366f8ee5e098999f8f0dda97acf7f9e52425d08749f5dd32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://artgreen.vn/attachment/files/sebivala.pdf In PDF document text
    • https://eetravel.net/file/93310841292.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/mikidegiladupadefujim.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/vixax.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sotujofuvo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/12040838554.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/88614989181.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/45037149327.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/3339110146.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161391c2e5a95e---kegunojogekotukexe.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/zoxavunig.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/pofoguximolarikixesoviw.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/28145416902.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/xonij.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/51781451620.pdfIn PDF document text
    • http://lagrupacio.cat/file/49407069742.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/vidororufufupaf.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/32511623725.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/pirelalisutevidesi.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/mepukefofogipolokiwil.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/98397894779.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/57803382983.pdfIn PDF document text
    • https://aildf.in/userfiles/file/mukupiduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bus+simulator+ultimate+money+hackPDF 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_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 10856 bytes
SHA-256: dd36fd30dc0930a3e81cdd4b09c277e9292b5bb410a86ef13cc355afe47f4412
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 17904 bytes
SHA-256: 921d940e67eb080a59f3480a29ae27657dc30cc4c8a1e4d7593d7061ac2646ed
font_02_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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