Malicious PDF — malware analysis report

Static analysis result for SHA-256 48874cc61c141e90…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 16:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6fbb74347486475017e3d64350313bb SHA-1: 27fa021a9ed33d4822724159e527ddef6f29b7a7 SHA-256: 48874cc61c141e901661135f7452cc826c7e41351214bf9d1f9e5da77a69b14f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and the presence of multiple links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://santeh.md/img/files/risigoduwop.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f618a33ca---25468478452.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/91128058644.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/gedubegapogafirugat.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/ziremamozenez.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/8482837446141be506d2e5.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/nugosiguwivepeluguko.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210910_225101.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/85773380405.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/44261802509.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/98124196865.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/23787890364.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/28392073273.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210902204714.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0a8d6a6680324c118b91c14d72313bc2/xivokuveximu.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/51470744948.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/ruwigavobefulumo.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/bejomolodig.pdfIn PDF document text
    • http://enewind.com/pliki/file/jugikaxiziligenetarus.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/sudafabikiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=a+house+divided+season+2+free+onlinePDF 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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 18296 bytes
SHA-256: d521e3dfdfaadc842f7df95e336708462fcc15626919e5dd104c96178bb782d6
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 10620 bytes
SHA-256: a69531d0c213ace6484f2f34930e8201c045c9bbb863f134414216d3344ffb70

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