Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc4cf373366ebb9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 18:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 03e580ce299d69a278a89e8c8033ca4c SHA-1: 6148a6a996630875c1fc83c42712ebae7fc98687 SHA-256: 6dc4cf373366ebb9daa19c22242470f58ab06ca9a364ad59ea888d40661747a0
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=rooter+android+sans+pc PDF link annotation
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/45618470627.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/90413238755.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/wikulifopuxuve.pdfIn PDF document text
    • http://erictex.com/ufiles/files/favojapugo.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/63664769083.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/zefeger.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/bavapuzezowa.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/38557516344.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/68856983262.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/wusovegobulabakubukiv.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/narinajaweno.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/poduvumetexuxofufero.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/65478062226.pdfIn PDF document text
    • http://ladna.pl/user_images/file/77041553073.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/gazoxovefasiwus.pdfIn PDF document text
    • https://baglab.pl/galeria/file/gafezupikizi.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/60108644052.pdfIn PDF document text
    • http://c-six.it/userfiles/files/20599525536.pdfIn PDF document text
    • http://www.agot.pl/upload/file/38864243695.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613615856b821---99287891669.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/juzetebesorisitaxivoseva.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/50380272492.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/gajisilatoketipav.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujapupegu.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/zogisakebad.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/65613104284.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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10508 bytes
SHA-256: 532273969b4afb58f19319e1d132c6609e7ee479939a820baa6cc5bd081fd5fa
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 18072 bytes
SHA-256: 73a96374f8f95875f94edbd613871ecded8bb7d5588f041a634e13eecfd6e6cb