Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ece040491e9ce3…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 21:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72f0bb12d56f48aa16aeefac7dc992db SHA-1: 043fb45cdd0d0188cf0a295e04c2fe7e12a2a681 SHA-256: b3ece040491e9ce3607d122554dadab26678882b3f9202ae37693090896b5eba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature of the document point towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vignolaweb.it/ckfinder/userfiles/files/94598001417.pdf In PDF document text
    • http://metafelix.it/userfiles/files/zerin.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/tizajekalizazoduxapu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4b1938fc---xuvasepiremaginob.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/sifugoj.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/feletuv.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/60953065740.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404aa13b11b---tuzanujoratubonugodeg.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/fukolesugegotetokixo.pdfIn PDF document text
    • http://www.bash.cl/media/file/rozarudibilug.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/55188956683.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/zosawujumufu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909030628236308.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914015642.pdfIn PDF document text
    • http://186086.com/upload/files/94543679555.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tajawe.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109220849338508.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/majudatidelifar.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/gexebum.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/mirofizavuruwak.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/40287267779.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/nusopiwusazerukaxujisuw.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/guvewumulesod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ipv6+osi+layerPDF 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_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 10344 bytes
SHA-256: 7e95bce27709511681a3f85b295b76b5f72531095982af90b4e6dcf268c07b60
font_01_sfnt_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 15500 bytes
SHA-256: e0834374ca66b78d2014d14cdb67821811b4116c8a71f4cb8dbe2f6ffc989b43

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