Malicious PDF — malware analysis report

Static analysis result for SHA-256 9972969b3f52c47b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 10:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ebdb16264a7223bf83adbe806508a7ab SHA-1: 0d0da2e07810df3f87a0fd295c4307d81d3adeba SHA-256: 9972969b3f52c47b46605cba0966b32c6a91c7bf55e5a703121631c374de8738
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier 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 an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of many external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b5b8d4b9b2f324ef99f0c841f7fc5377/tebup.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090801063996.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/91984465236.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/30335083565.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/weles.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909051734.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/rexulovewobujonimi.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/nikov.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/pulakabedulakeneganod.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/43361688581.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/16339421698.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/5237582990.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/67620330018.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3204688c9---32968262765.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/zexera.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/80888975081.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/mamavepa.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/48307194680.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210913112725.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/xugubevetud.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/kogatavudafebej.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/16917704478.pdfIn PDF document text
    • http://proart.by/media/file/vixufonoguge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=top+10+best+chipset+for+smartphonePDF 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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 17848 bytes
SHA-256: b929ddeb65982685ca322324a0c44822e635de906cafb5508eb0572021b102b8
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 10976 bytes
SHA-256: 0da430f4840607ceea8e46a5da2f8e22ad597ddeed9ad9d88c6938c5da65f5d1

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