Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff9d5984ac49f4d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 20:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b56fed2abbdc0df81920b94dfdd7511e SHA-1: 08ad9f457a61830c6f6d94918311562e09774f65 SHA-256: dff9d5984ac49f4d7f6cf508d9bf7bcfb4dac617af7e5789012908452614e427
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://les-dvorik.ru/userfiles/file/farezuxuwogedi.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6cd92676bff095479620a5f3015fd906/levazugivi.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bidum.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/soxoraboko.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/40781494541.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/9073150882.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/25009494488.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/pedon.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/bizamaxinuxajovibunifegu.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/64785441291.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///detoguzenanegojosa.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/42153428252.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///lumeroxutovarewu.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/gomovak.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/tidejuzelaz.pdfIn PDF document text
    • https://cartolmania.it/file/risafevokuwulumosuri.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/xavasawuxavulazoziwuxobam.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/12065885656.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/97101093826.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905115655.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gimupinubavolamukijipavag.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/80510508632.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/xafibowuxajovanuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fifa+20+download+apk+obbPDF 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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 16932 bytes
SHA-256: 00260cb7ad4a6c24e92242c49bec21ae378de4439be4de35c2e317b6a16294bd
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10532 bytes
SHA-256: 1291e72bad6b3589e792c6778300a625fb07bfa349f130bf0ef31cd596755615
font_02_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1