Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc44996fe8fde726…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 02:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 296cab72bfb9fd4b22b8baf27a98f01c SHA-1: 8bd7faeffc62c330021aeba7e5c919a5d2337f11 SHA-256: fc44996fe8fde7266b6920ce0c34f4a03cd6d209c06edaa09854845ae120889b
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 is designed to host a large number of links on disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the link farm and the ML detection point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://museuminiaturesbesalu.com/files/roxifowifusedinavenex.pdf In PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/44268054452.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/pesimaxavedajonimi.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/51394488241.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/romasesafenikorilujep.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/givobobakoda.pdfIn PDF document text
    • http://offerparts.com/upload/files/56715524025.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/76304929476.pdfIn PDF document text
    • http://beta-rc.com/upload/files/3769326585.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/37606604627.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/woxelelew.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jalizuxomasodibawijil.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/fegezulanopeli.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210907_39E07ADD50369D23.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/71678989205.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawosawemudoxovaxugejib.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cc8vmcu0k8mqgdqmiiomi3cij5/pikasagixoj.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/85159211144.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/vabobi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5594af8a0cd79f6eb098f071f816297/silejofiburiwasexufupipab.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kataxebupevi.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/tirojebanizisapozuwutatu.pdfIn PDF document text
    • http://leguido.net/files/65641247269.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/64445930456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+train+your+dragon+3+full+movie+123moviesPDF 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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 19136 bytes
SHA-256: 57bd7357d2dd00fb8aea8014bbfc52c30acf8089cf464bb8200a0fdb170c7155
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 11396 bytes
SHA-256: b322e3fc64b46e84886971119e8866e16f6cea44b3a72cff1f5376167aac13c5