Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21bcd3b1da47d1f…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 04:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d5c7bc6899a4cfb6b19ef5db466f0ae SHA-1: 52a702e6740b402d53486d195eb4b5b61d20da8c SHA-256: e21bcd3b1da47d1fbf6a7a7e9e67253c81b72e9b153540b531673f497b5f87b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stavo-bazar.cz/userfiles/file/50950761558.pdf In PDF document text
    • https://fuoriscena.eu/file/43832419321.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/fupigepovomomanuzasaja.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/ranigokodijarososaxuro.pdfIn PDF document text
    • http://kvrhousing.com/uploads/vejosatotupokagopusejasiv.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/mutali.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161480a4f2942d---50982513842.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/8614713506.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/74015994363.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/33678019555.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/92751965629.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/buzujepagokegifox.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/74074910674.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/dalupokaralutizanafum.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/59434976193.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210917001933.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/dafabog.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/kujasitefepemesu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614583be366a7---94490619046.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/57344406250.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210927052202.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/linizatuwedaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=x8+sandbox+rootPDF 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_off0000ab9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9D 14816 bytes
SHA-256: f17cf0b41d3fd81cc123b3c65d18b0d8b808825824b449a179bbdb6c1a9aa6bd
font_01_sfnt_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 10428 bytes
SHA-256: 76a08e5a69ea9bbb3b0f338743be12921a8919af6cb4788af13a55a4278a64c2

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