Malicious PDF — malware analysis report

Static analysis result for SHA-256 9210ba9764eb7933…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 07:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8646ad32f03b4d5e4907feb09c47a23b SHA-1: 640a29d4b8dc042c60c910113a7431acf1a80f9e SHA-256: 9210ba9764eb7933f9b989da237c2a09181bd976a7ce224593a695615471e877
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. The presence of multiple unknown URLs suggests a broad distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://cairparavel.ro/app/webroot/files/userfiles/files/demuzewokimes.pdf In PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/15526934978.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/18115960561.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/famamimopugene.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vamavemigununojoxof.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/71344439859.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/72490557114.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d058212a7ea8bf1e45853711f0e3786d/jitetaxewuvotipikanoz.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/xasojixifetagebonet.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/76932940777.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf26eb0ef1---kobaloxixokevuxafuzo.pdfIn PDF document text
    • http://p-energo.ru/content/file/27634316808.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/gojemokazisavafunudubu.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/nitudigajugojelosezedid.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/mamodigepe.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/vumukuta.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/67258195396.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/97123143868.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/fotokagobiworojesavogugek.pdfIn PDF document text
    • http://perksys.com/userfiles/file/gikexekobipexijimojol.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/sefufaxomosojupomuz.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/71205466266.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/rexiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phoneutil+apk+app+not+installedPDF 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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 18372 bytes
SHA-256: 7273c281a1f5515c44d0e93a3b0a5103c743ddc9fd9d6a879d495ec050ada7c6
font_02_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 10584 bytes
SHA-256: d408a472da70db52b79cfb4317dff88782daf6647063bb787561ff65fbd8dcd5

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