Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28ff89dfbfc4251…

MALICIOUS

PDF

74.4 KB Created: 2021-09-27 22:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acfa2e7732b97b688bdd470cb3351424 SHA-1: 0c886590f309f55f7f64655d9cae75d934dfd952 SHA-256: a28ff89dfbfc4251faa587e47b518a052e6f720d72c4b42f34edadde732c30a3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pui-vital.ro/msg_media/file/36790617642.pdf In PDF document text
    • http://vencedor.coop/images/admin/file/vererivaje.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/todatujovi.pdfIn PDF document text
    • https://anaksemut.com/contents/files/losasemikuzefipika.pdfIn PDF document text
    • http://espwireless.net/uploads/file/66667905765.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/mugimafujovurategole.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/xusus.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tifonaratijoletalagolina.pdfIn PDF document text
    • http://abworder.com/uploads/files/vivewer.pdfIn PDF document text
    • http://surestegc.org/documentos/file/20404503482.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/61166932722.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/guzitipebeno.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0d5fa2a38702cfe94925995b2fecc35f/99735431616.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/4004322535.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/881722729.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/tebagakap.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/nalenawixo.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/sijugewonaf.pdfIn PDF document text
    • http://ruihuitax.com/files/file/99100728405.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/tabedofuwukiwewuxunerus.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/raxatatadarokexudus.pdfIn PDF document text
    • https://miet.hu/kepek/24365407398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=avengers+infinity+war+watch+online+for+freePDF 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_off0000b9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C0 18188 bytes
SHA-256: a2793ce0309ce2c69db49181b1ac06b6a3415765f297ce3ba817936e3ecac877
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 10860 bytes
SHA-256: ad808688d809e97842f3b966a26f8eb94b446bb78c0d5567bfbbec762fbd888b

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