Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3bad6bc3920427…

MALICIOUS

PDF

68.0 KB Created: 2021-09-21 04:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97b4972d28135f8fbfd6a383b4de4396 SHA-1: 226b78af1dbafd9a0deb5faee0bcda9d236d1773 SHA-256: 3e3bad6bc39204274dfd6dcc38d92ac6830a00dd0f74d90c21bb693701c6274a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://scuderieverdina.it/scuderia/userfiles/file/riratisobulimebux.pdf In PDF document text
    • http://free-note.kr/files/fckeditor/file/530827620613aa314b43cb.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/12777373563.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/93590033005.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/mitinekixasu.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/tebutasonod.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/livitu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/12482616867.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/zojupanewojujafaz.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/napemetawusiluvufimotu.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/73845379663.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/32021743740.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109210937145461.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/49065364489.pdfIn PDF document text
    • https://invest.pl/userfiles/file/37254730925.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210911144650.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/24475483001.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/15542807302.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/60651136772.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/99381918537.pdfIn PDF document text
    • http://szpk.hu/_user/file/wepagisuged.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb44f4da53---71118668917.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/woxajotinuxolasoxitus.pdfIn PDF document text
    • http://rld-carbon.ru/file/kagemusirotusomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=online+ppt+to+pdf+converter+freePDF 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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 10372 bytes
SHA-256: 87d9b2dda3d3ea15ed35b689858d9446c159d6330c6defeb502146f26c34ccd0
font_02_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 14224 bytes
SHA-256: 81673020a3bf45846ce6b09483768ecea3093a86a58f66d39e654e18981fe3cf