Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ae2adcace1ca4d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 05:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7809438e6d8ac3d29463787fc6e3cae SHA-1: 81e9524b754ea411f4b06f6391439682f55dd0f6 SHA-256: e1ae2adcace1ca4d474705a1f72cf2f1254879134376092f81c895606e67e350
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=mario+song+piano+notes PDF link annotation
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/90612020966.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_025835.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/61444730070.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/bajuverulot.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/9769462439.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/65378717435.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/1986840879.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pukimarexivavijoro.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/gowapunejezigukiraziruda.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/fexal.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/soberojakuleluwib.pdfIn PDF document text
    • http://talesma.com/E/file/30684701410.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/pubokuvagesodi.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/4175084168.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/88070259641.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/40675861009.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332a7c992dd---bamevajitukof.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/webexowogitugob.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/35487940282.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/57511372152.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/radomeniwege.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/60169535143.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/46293925938.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimokitofoponezezev.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_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 17084 bytes
SHA-256: 6b715cd7ca334eba96c2bd03b17a97604010c5d4854432251624d2a4d458a06d
font_02_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 10372 bytes
SHA-256: 4ac37ee7288cc222e4e8615d4718d033304c310ac8b76d950a97d00fc5591b5d