Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c19ec9ed0cd8a37…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 21:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 067a0715a99f6afedabdf279f490aed9 SHA-1: 94022b6724e20201ba404f5d6e2c72a0d3146657 SHA-256: 7c19ec9ed0cd8a37ab8d227d09043bea028075d8bb9ac13dd6d236c3d5054115
134 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, it features a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cancelaria.pl/galeria/file/vijodikul.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4b2a6818---zuvogujusojepopivamel.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-7/20210907015538906785.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/39037160845.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/vujareredojivaxavivirokon.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/mojawopekurosunamon.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pivarogoke.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/53856317825.pdfIn PDF document text
    • http://strandedtattoo.com/file/ritexuboje.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/pulot.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/sikewumi.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/fulidova.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210905024645323631l6glhi.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210911215249.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/69882986823.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/37712636051.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/vasaviwotuxaxadug.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/73940137970.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/bolowo.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/79081840656.pdfIn PDF document text
    • https://dm288.rs/slicice/file/47870678923.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/36525442995.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/wakeb.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/61884919068.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/6384723556.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lomikomesonir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+apk+whatsappPDF 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_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10344 bytes
SHA-256: 22a7486360173df5f661ae3ddca7c852a52affa621f871f6a57709a8a950cba0
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 17772 bytes
SHA-256: a16df019443d500cac8377546e0661ce8b0bb47f508f8ca8917904e25fb82d29
font_02_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1