Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0d1c316a5b058f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 22:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c12f447b54fa5bde9369baea9766a925 SHA-1: 6d8be57241d2b6db9fac5d3e6e686b10f09088b0 SHA-256: 4c0d1c316a5b058faa9767a9c0ff1651870d9d7c847c3c75c402cbb27ccf341f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=aplicaciones+imprescindibles+para+tu+tablet+android PDF link annotation
    • http://immodraft.nrw/images/architekten_agentur_images_/file/79782015435.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/fizonegolidafoteb.pdfIn PDF document text
    • http://sinners-party.de/media/file/89216738151.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/takafuninijisejawi.pdfIn PDF document text
    • https://ijpdua.com/contents/files/39772504720.pdfIn PDF document text
    • http://ativn.com/upload/file/zelikufazaruzukil.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/gigoguzuja.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/23438182953.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365f83b5091---wuwugawoxovorup.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/7796273922.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/rakopubemujebanetunu.pdfIn PDF document text
    • https://profm.hu/files/file/boxemikesoneteveli.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140535c8d3b9---pamoj.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/tojeb.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lirumogorasobufakoz.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/garivumud.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/mivirozabijiwujad.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/mofatar.pdfIn PDF document text
    • http://knipia.com/userfiles/file/54803985343.pdfIn PDF document text
    • http://reflita.lt/uploads/files/witep.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/35373271669.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/watilunopanusopomenoxe.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/61970434558.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/jimazaridolopogejox.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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 19676 bytes
SHA-256: 058aae8da486c64849502e25c7bdb84fd6c5ef0b87bfacb1228ecfb157f74ebd
font_01_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 10896 bytes
SHA-256: 1d1fe7309ce5901b0a4da64f8412f489fd75fca0ed1e78f13482d50cdf3984e0

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