Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c8a8907a8bb5da…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 03:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30e66b007aeda8e0f3ae7cd2e3780506 SHA-1: d326e29ab29ee4e1b8f626eea5375d00f5975d4d SHA-256: d1c8a8907a8bb5da24b42c413aa5317d1cd5d34072d05dec6b8516935608f5db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, with one specifically pointing to a 'yts video downloader app', indicating a lure for potentially unwanted software. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://karthikeyanjayaram.in/userfiles/file/10419283113.pdf In PDF document text
    • http://sklepjola.pl/userfiles/file/63506903281.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abaabcc42f---xenulumolabez.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/30681624354.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/xobutuwufiraki.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/81888935773.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/65524701629.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/jotetawupuveba.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/24311252479.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/dasajazuve.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/wafumizawinu.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/xaxuragisiluwebajate.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/2492492515.pdfIn PDF document text
    • https://palet-school.com/files/files/werirufadusiwub.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/nubuko.pdfIn PDF document text
    • https://maturana.cl/upload/file/natujolikogisokututijefus.pdfIn PDF document text
    • http://vswet.ru/f/9853481957.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/kodelogafudi.pdfIn PDF document text
    • http://domainecomps.com/documents/files/gufisopulora.pdfIn PDF document text
    • http://anindecor.pl/files/file/5566231071.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/gupalazobuvokit.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/20479742597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=yts+video+downloader+appPDF 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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 10520 bytes
SHA-256: 6e426ff668c38a99fdb8e29f37a6094c5cc75d282c7c64fb286652c98721009b
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 18064 bytes
SHA-256: 8af5d33899a3872c66d1fab78a112d3977c43b7756cf290e476c70148e2d1baa
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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