Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f97265e410ae114…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 05:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acb599d334848cc1d5f59cfe566c8698 SHA-1: 9bbd8d1b661861fb395045e8aa33bde750ee5756 SHA-256: 2f97265e410ae1144f03b5475bf0256bfbe7fd157c4f53470e86256f54dad039
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The embedded URLs point to numerous other PDF files, suggesting a distribution or phishing campaign. While no scripts were explicitly extracted, the nature of the link farm and the malicious verdict strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hanoihome.net/img_duhoc/files/tifetepikazuxup.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/pozolo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xasekinisawamerakigapewuk.pdfIn PDF document text
    • http://edallyshop.com/upload/files/dojagino.pdfIn PDF document text
    • https://ancoraeducacion.com/images/99686833005.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109012251297151.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/vezixutaxowasoxal.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd8f694bb---52979232779.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/60920207727.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/67622571595.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/94396707430.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/5486310498.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90203805844.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zegerij.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/fobebesimo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613310b16700d---molali.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/zalusuwalakove.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/80405206227.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tonazit.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/sawomobizedevofasezezedad.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/22872583292.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/61219743990.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xadomulasemufubizakid.pdfIn PDF document text
    • http://uco-kampen.com/media/files/visurukavevobezuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+money+drop+xbox+one+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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 10748 bytes
SHA-256: 0892737b97c8be8cbce1a91c93ef08cf65284a1442cc45613c0d438ba652f997
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 18496 bytes
SHA-256: 8c0e13e0afe9cea0e2c24a2479b61bf775722714d0ee1a734a40a1d493c3704e

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