Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b223a50a29208f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 10:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de9ea2ad5950294fe2ee44a0ab9a8f85 SHA-1: 17922cfc6c4f6c764c1b6020048237685372822b SHA-256: f1b223a50a29208fdf4ef76796c2b3a4ce1a5a64cfab117d4fa0d75b5eeac41c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many on disposable hosting and utilizing UTM parameters, suggests a phishing or link-farming operation. The document body is heavily obfuscated, but the overall structure and heuristic firings point to a malicious PDF designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=christmas+stories+read+online PDF link annotation
    • http://veronikavilla.hu/userfiles/file/40082227346.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jozogiwepopivesijad.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/89829270836.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zajelimapobo.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/56033374582.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210916151009.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27834218535.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/66832367865.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccde03753---kenegidodanowu.pdfIn PDF document text
    • http://symbolfoods.com/files/file///figetabumofanesumut.pdfIn PDF document text
    • https://norservis.com/files/files/megawoterevikepumomutuvan.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/85811155791.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/5411746848.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917203546183207.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/99251778735.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/889ffbbbb73552484a86c620722a2e78/59302682335.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/dewupapuganafepute.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/14470390432.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/63964172734.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/tigiteforov.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/zijumogamesobovow.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/dogopikexovilafeb.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/vegikubipivineradofujafe.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/40137723868.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/16928596450.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_off0000be42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE42 10544 bytes
SHA-256: 8284d41a853bd87571b831a7812f527be5435b9fad2bb002d31ea0e489995251
font_01_sfnt_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 17596 bytes
SHA-256: d74530613454cb566c92ec38aebc9bfba1c5c8196a544620e75496084deaa815