Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad06a98470f5a1a1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 10:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 686157e5f65c74c485464a66fe922554 SHA-1: abc341387023e0b5baee51a3bfc0e58981b09838 SHA-256: ad06a98470f5a1a1e582ef4cc30eaba58233f1647dc8dba6a21d389ae0af9e80
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs pointing to disposable domains, indicating a link farm designed to host further malicious documents. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/rogabilimolokanagobe.pdf In PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/nipalawotun.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/709506f7093ba8d88725e64c8ab059fb/6925518145.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zefetiziv.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210904174830_9ogbh7.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109090410408426.pdfIn PDF document text
    • https://clinicscrm.com/img/files/16698897154.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/91428001485.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jutubulejobepebibujife.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/12576825338.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/78581164069.pdfIn PDF document text
    • https://topupdana.com/contents/files/guliduge.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3421c4a8f---33115661565.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/gazufodesuxilagaderoni.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/tolakezuboxu.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/83213442883.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/13083014480.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/51765317032.pdfIn PDF document text
    • http://ruresept.ru/files/file/36477983214.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/42165111255.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/61282052210.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/ranitorimalegitije.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/2101245230.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/14839462432.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/61112322893.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/70718952452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=play+store+auto+clicker+automatic+tapPDF 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 10736 bytes
SHA-256: e6971cb45b58473d17b5c6e4e8ba123c24549e41d23765875311290503f35b70
font_01_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 17260 bytes
SHA-256: 3a540f898b8458bf02f026b3d4d0a2b4a0c854c2b6216e57d958951312fd26b9