Malicious PDF — malware analysis report

Static analysis result for SHA-256 985a082432069d4d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 18:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a512c38a72fe298d8bf943d58a8d8f9 SHA-1: b0cd312f6ba79d223dc20739b11e191b65c4534f SHA-256: 985a082432069d4da44570a102f1252c8da73698c3bad0341be28eec884b4f95
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://nktrading.qa/file/files/dimibuxelarezotupunetoto.pdf In PDF document text
    • http://tavaszitura.eu/userfiles/files/kodurorekijenonamiva.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/pewaseparobanuredal.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/rebegojolisoru.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/radometebadupunaronurabom.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/89829270836.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6ed6a89c---82599374216.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/92577893350.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/45849349255.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/renowebinofuxewegujepe.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/ziwodozogomofubaso.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/toxopug.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74886970885.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/17442920640.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/83591871780.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/26307838851.pdfPDF link annotation
    • http://haciogullari.com/depo/sayfaresim/file/roxejomeperibajeketodevi.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/bumirolosof.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/barigogefadowes.pdfIn PDF document text
    • https://ka-base.no/images_content/file/18233226261.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/4439585718.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/pevaroxenu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/57599466839.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135088657242---67827664374.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/raretalikejulisuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+apk+tekken+3PDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10376 bytes
SHA-256: 3e303e6d6d82ce5ef0ef8a727a95e5d2fb937ba6f434695997a036e10de58395
font_02_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 17880 bytes
SHA-256: b5a3683dab45ceca75bfbb34ea74dedebf1cd53a8536cd9d5b27c9ed9bf9fc03