Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a7e755bf15ce7e…

MALICIOUS

PDF

67.7 KB Created: 2021-09-09 19:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f61686b85da1e3d612a8c81cb392888f SHA-1: b0e8c0297e006c194a050a8fcb5594b2ee6d5700 SHA-256: 60a7e755bf15ce7efc76f0beb048a4b25e10350cb1894e048fa61399767e3886
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous PDF_URI and EMBEDDED_URL findings. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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 https://kclandscapes.com/ckfinder/triplebuserfiles/file/xuvikoxopuwomevoje.pdf In PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/sopone.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/rikugevozekosatokiwivir.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/kesifelekojisikaker.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/kozikiruligadawuful.pdfIn PDF document text
    • http://kite-surf.sk/files/25421611575.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/77787169593.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/99543025216.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/liwopezozi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/luvubuxikafodo.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/35708622342.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/geroxam.pdfIn PDF document text
    • http://arablift.net/userfiles/file/gaxotatuvudezekumiralev.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109091152563119.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xomezofemoputelotutebu.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/87362671864.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/gejisixabupefadomef.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210906025901.pdfIn PDF document text
    • https://kimcert.net/E/file/wilefifu.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_0553ABFFBA6D47D4.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109030345421893.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/92369290626.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210908044419847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=1+on+1+soccerPDF 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_off0000b00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 9780 bytes
SHA-256: 06ba85befaa295eba3b5a71eb04ebaf3050545854fa1e3e9240d985711645801
font_02_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 14764 bytes
SHA-256: b9720ae38608e45e869152d5edc1964933a83a4cd8dd9d692c84599dd70e8d4d

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