Malicious PDF — malware analysis report

Static analysis result for SHA-256 4565fc77f337bdc1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 20:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5dc919b0ab126c807f855f8ddab14a2 SHA-1: f651b7a5dc2d67f8604103812a8046c921678b6a SHA-256: 4565fc77f337bdc165bc0b5dc25f4b2af02efc7eb5275925f817141fb8099b0d
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 numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links on low-reputation domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=singular+plural+worksheets+for+class+2 PDF link annotation
    • https://sofupingame.net/calisma2/files/uploads/guvujatu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/lemodepuwexudo.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/36798011228.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/govivodivak.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/magetokedoloj.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/100552072161318c69d719f.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nekoxivuzevibogutag.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/wavawisirobozo.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/luzapabozosagaw.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/dikekoxizene.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/venakogelexutulomebova.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/vebofofu.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/fededilofiwividorup.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be5aab37387ad0b974cdc74dc9daebb1/77821186489.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/toloduwo.pdfIn PDF document text
    • http://jinyezi.cn/upload/wikugojivixonefi.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/nasajiwadotajuvopikomemut.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303bff78f06---zamatemupamepuxigosabo.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/43523618669.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/72744865065.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/70997559307.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tonigijomido.pdfIn PDF document text
    • https://mkontroll.hu/File/pimenolexizo.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xozabamidujiroviduluw.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 11232 bytes
SHA-256: 5d05a4089a98b86f83431037b489e8dcb059f58604021342f654f02587e85759
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 19072 bytes
SHA-256: 9d86bbaaecf8e21c98f2d5d3333cfae6ddf7739a36c82c76f5a27317deb6d006

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