Malicious PDF — malware analysis report

Static analysis result for SHA-256 478f857dd168cfcd…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 18:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: bfb805503e9c022ed5de61a18ca9c87d SHA-1: 5da3b3cdd4aa87217871962ec558510b20acc1e1 SHA-256: 478f857dd168cfcd68971548a8c5f55a3cd8c6c821bed5918cfd8f453bb1e7b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=conjunction+worksheets+for+grade+2+with+answers PDF link annotation
    • https://coffeetuanvang.com/Images_upload/files/90356414159.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/fesokeluv.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/32300878950.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/modena.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/37164928910.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/17171509174.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/sevufumasutidilibexem.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/20248067816.pdfIn PDF document text
    • http://bulmarconsult.com/files/tebosuwelaruterelos.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jivefitor.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/71930785245.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/46355721251.pdfIn PDF document text
    • http://monyetjoget.com/contents/files/42490997368.pdfIn PDF document text
    • https://emenu.hu/editor_up/dekuvimeserazazez.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/wufomalirogonu.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/zuzutu.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/norozoxonifogakudomap.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/98489685681.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/wiferane.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/tanixe.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/95556364601.pdfIn PDF document text
    • http://agama-rc.com/upload/files/57293189432.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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 17580 bytes
SHA-256: 290f8dc63aba88df4477ffd719c33c4c5da8c06895cc6b4bce6c6f96b1525400
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 11268 bytes
SHA-256: c7994a8863358c1f7d4c11d457a238d588a1cd3ccb82d04024220a6bc94a9151

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