Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0950362d9d4b86c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 09:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef9dd9154a5aa5c0fac06a0b20819398 SHA-1: 2b217402b8d737ab86443c69996072861d3a3e9d SHA-256: b0950362d9d4b86c862c6924a8e6280b959dd94e323898bc292f1771f40e9cbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=build+craft+3d+mod+apk PDF link annotation
    • http://gamboeng.com/assets/ckfinder/userfiles/files/nepojukidolejifam.pdfIn PDF document text
    • http://kotolantopeni.cz/file/zagesunimedudukolejipisof.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/zukanulatazanuk.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/37246574987.pdfIn PDF document text
    • https://securitydm.com/slicice/file/88653940888.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/salapugewukifu.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/junuxus.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/49364321970.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec19f3000---69267587903.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/renunepasodazewit.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/siritalaviredovini.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145752514ff6---26343276880.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/120933236168.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/sexagivefisa.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3032402678.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/54451869348.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xuvidekuwoboz.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/54027514442.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/35428915172.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/nigurejebuv.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/pikoxilitamufemu.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/kikekofemor.pdfIn PDF document text
    • http://secretinvitation.net/images/files/71779590592.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/watovama.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/28439439213.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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 10792 bytes
SHA-256: c464a56709a36bb6d7812f3171ed77c8174601b66491d206019ad4010452a09d
font_01_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 17492 bytes
SHA-256: c4d61af5d771e8530d4b7ca2f0a0ce8d50e6da76333ed701026058ce3989e4b0
font_02_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1