Malicious PDF — malware analysis report

Static analysis result for SHA-256 d253c16a04b5844c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 21:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 462e9d760637b5bff5a1e3e21ce5857e SHA-1: 4b3f5fde88d850a1f368065f36cf86b936d4178a SHA-256: d253c16a04b5844c56fbb19daf4e39dcbb1d3cc33bc1a6712b0785274e495af1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

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 http://stroyvodservice.ru/upload/File/tifatijoju.pdf In PDF document text
    • http://china-miyaco.com/img/file/20219611256.pdfIn PDF document text
    • http://quetthe.com/upload/files/713595521.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/efe72e8bc201384789271417527958f1/36216489306.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/52231737164.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/jigusetoputitaliraduzama.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/lovodelokojipubu.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/zejop.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/39474182107.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/69809862814.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/49558863029.pdfIn PDF document text
    • https://ratodua.com/contents/files/98716061999.pdfIn PDF document text
    • http://budka39.ru/files/jubupuzu.pdfIn PDF document text
    • http://apart1day.ru/file/20107281159.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/xowodojozudaxukimaw.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/23983877174.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/7663735873.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/80475758832.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/guselexupawefitelijowiba.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/16580460492.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/runotuxuwiwefavovotugoret.pdfIn PDF document text
    • https://rjpexport.com/files/42732684352.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/fuwarupapuritotat.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d038780c---16248193257.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/74382139431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=my+dish+app+download+for+androidPDF 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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 18980 bytes
SHA-256: 676ca7d3836091e46e1df4b6c45148ce889e10f5dcab97fb8df68b23a753108e
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 10560 bytes
SHA-256: 3b2b8d820f68b4decc395cda9561590738c26340a0d89a3feb2f2acd272f6a14

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