Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bfb1950ca5272e…

MALICIOUS

PDF

94.4 KB Created: 2021-09-20 11:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da1ea6ab693fcff6c69deba33f38617e SHA-1: 0e5684219f5883cd16b7bfc062b91c5a4027fd94 SHA-256: 42bfb1950ca5272e1f4e9fd25d3f2a0099f46f0e8569d3b42fe30590b26e9111
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=charmed+season+1+putlocker PDF link annotation
    • http://hasdeu.md/data/userfiles/files/laxurotexodowuben.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/parigikokemiv.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/lotizofoxepipelitemudali.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/janened.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/xaxupuwutavidunosegiwale.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/pewijetogutukidifiwewiziv.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/14085424930.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/zotubasoxari.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210918043818.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/xijamejituxe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161313905a671a---gugewijewit.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/duvodapejedagetoxumom.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/devodubogepotawuwi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/83385453470.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/gimebeferumofuxul.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/28076916863.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/dilijivuzimodup.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210907103355.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/60434074855.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/16135116185.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/70369493181.pdfIn PDF document text
    • http://identik.hu/editor_up/wavazujokilakujose.pdfIn PDF document text
    • http://email-database.info/userfiles/file/zodijanure.pdfIn PDF document text
    • https://okazionche.com/files/86513198375.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_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 18360 bytes
SHA-256: 2448926184815e74699e21be1cd8116a1e39a89ecf84a9a9a7765a6131e358a1
font_01_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C6 10960 bytes
SHA-256: c232dadbbc2673b68a7176f4bcf634bf63092b5b8c5ff86309d871d0d3623914

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