Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81f543a2a03057f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 12:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10fd2b5ac2ab112a0d3bc6ba38b21d60 SHA-1: d3386279a3ca51f75b099fb1e79f71120252a068 SHA-256: a81f543a2a03057f1b6a63476d9fca9c19d2e7b05c0a015c050d339f7da0d049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or unknown domains. The presence of many distinct hosts and the 'utm_term_redirector' flag suggest an attempt to obscure the final destination and potentially trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/runakazamunawukomuxusop.pdf In PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/83783520692.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/92170020788.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/21978298302.pdfIn PDF document text
    • http://mamitobe.ru/files/file/19777083687.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/limefifagonul.pdfIn PDF document text
    • http://usateatop.com/_upload/files/xizenuxug.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d316808ff8---38428689925.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/makini.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/71080964687.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613422cb392d0---nemudoxasemozuzijarovi.pdfIn PDF document text
    • http://17njl.com/userfiles/files/27910857105.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gotetifovonadurasazunu.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/sofewozolenapuwo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nolefivemabapedoxanavim.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/potorekenonak.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aad37516---62168082569.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/86733940352.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/10674171826.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/zuxasuvugarogubilive.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/lepixijefi.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/10285328331.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/5447542677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+unlock+private+instagramPDF 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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 11052 bytes
SHA-256: 4824e1ba4b647112153129bdeab855a1e4a65cacfe079a463211828eb3b69be6
font_02_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 18296 bytes
SHA-256: c879cf6e63778e8742d0c9dcac9123af106b7f8cd31624c329911e7035781912

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