Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf24f8b359d4d224…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 01:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14cb695176aa9dc8c8375d18c451d71d SHA-1: a73063091aa473f7034748816322971a3e2b84e6 SHA-256: cf24f8b359d4d22457b7e615a7d3051ceece96cf82707b338b88722c75bc2d09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of embedded URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://slovoveri.org/userfiles/47647729531.pdf In PDF document text
    • http://yasaitogo.com/uploads/files/79376816408.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pabololemiviba.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/xunowagades.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/15976835365.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109171402525544.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/k4gcr2vadvghrov0obfn2gr1m3/8329230042.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/wixubipefanulanobepas.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/najuguzugujexozev.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/68416067892.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/fivafutemosiwidoru.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/jolirelafibosavovodelugo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421cb5a42d9---movezamawugalebozikokezi.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/pivezenutazaxepu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/kusasovepidabolexar.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/86496523313.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/warejivumaxadigusonikeke.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/69426080030.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/lufojunumugajakovu.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/73592782929.pdfIn PDF document text
    • http://baove24h.info/upload/files/jozizoveka.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/5308424548.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109161311453010.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/donadawobi.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/34206541793.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/xapamuxitit.pdfIn PDF document text
    • http://suaups.net/userfiles/file/66219402331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=genshin+impact+live+wallpaper+4kPDF 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_off0000c0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BA 17976 bytes
SHA-256: 7231bf385fdff5ee719fc33a0480d90011e19b8ec3b26c62d92a72a75df5a0ed
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10880 bytes
SHA-256: 6c32668d1555aaf4f08190272db62283693a2d1f33f025c83d234cec28d738b5
font_02_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1