Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d98ab7c7afdb53…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 13:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5991184a255bbc84c97b0791ac839af4 SHA-1: 5077da000f83b2633b18bac0f59b91c293d8c068 SHA-256: d9d98ab7c7afdb53ee2d95150f6a23e723d77bbb0a4441836747233c77f821c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://studio-castiglioni.com/userfiles/files/91477350745.pdf In PDF document text
    • https://jobtiara.com/files/files/burifulivimegotujezesofu.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/42621746674.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/viwuzizibita.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_E6252B5B348015B1.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/vosegaferakobod.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/52740603538.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/30088707337.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/zomajaxuxeta.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/dekano.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/94874456171.pdfIn PDF document text
    • https://irantruck.ir/data/file/bexunuwonupifojilixuki.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/kuxijufamoni.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/bubewebu.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/vabejamavevozawivipoxe.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/51423320978.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/mamuloginunewagetepavalas.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161301a86f194a---62929580424.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6675ef736e77b35d74102ac492a3526c/73728948283.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///41716610825.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/61652297591.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/75766670647.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/52887967639.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/noborufebudepuba.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/sojavopama.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/rapizobuxabuwimitelipor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=retrieve+saved+passwords+chrome+androidPDF 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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 17792 bytes
SHA-256: 640b311d59c8703ef69edd3384de78fa30da6c4e5fd76de9751df4f435489400
font_01_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 10932 bytes
SHA-256: 8f58d5261c2340bc23758836227331dcaa611375fac2c099822395181c704333
font_02_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1