Malicious PDF — malware analysis report

Static analysis result for SHA-256 1376e52e23c92bf9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 19:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ea527d892d073954fc7bb57bf5ed696 SHA-1: 15e50078b1b1fca1dd35c63f5ddf5090160c54f5 SHA-256: 1376e52e23c92bf961caf50e8832cf860a199e5e2e7e788ab1d0c355c357fd55
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. It contains numerous embedded URLs pointing to external sites, suggesting it's designed to redirect users to potentially harmful content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=the+battle+cats+android+1 PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c5602513---80358374168.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/24129954267.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/1677728781.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/miragirojif.pdfIn PDF document text
    • http://davobio.com/upload/files/60720296219.pdfIn PDF document text
    • http://congtyvima.com/images/Download/24565640688.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/nulezegawusexaguj.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/23449374928.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/22190227706.pdfIn PDF document text
    • http://synfarm.com/upload/files/vomureketipadijavexe.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/35064824383.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tomativaxobufuxuzuxekum.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/88068080349.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wijapavot.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/92822338951.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/47309838122.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80389646266.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/gomofozokakuzo.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/99604229148.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fixirekudolez.pdfIn PDF document text
    • http://zzquansu.cn/d/files/tapev.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/79fq5gdcfjgtptbs2s9c5mtjal/10202745991.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/niwuna.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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 10620 bytes
SHA-256: 5e62ea43e6e27c18d908319284bc7438483d6f5f6ed98b9ca9ad2a8988e6303e
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 23588 bytes
SHA-256: abaa3c8ed655a90f04deb46b933a1945291da332a509c5924babc8c0cc2ba5e2
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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