Malicious PDF — malware analysis report

Static analysis result for SHA-256 4145727693143a86…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 15:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27ae36160c1980813e11c9f47a09a19b SHA-1: 8a5592468196b7f1937a450857ab5402687fd987 SHA-256: 4145727693143a8611e79fe851cd2117e910a362032d128baa62261b49352ec3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://airxps.com/userfiles/files/xativafolepojagabipusoref.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139e59ce1361---19891045507.pdfIn PDF document text
    • https://simorgh.it/uploads/file/jexudometejutuputapeg.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/gimoxodofawisat.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/57661771562.pdfIn PDF document text
    • http://jiab.net/userData/board/file/24098503526.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/sixupevudexosijupinaza.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/71627539694.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/18403928154.pdfIn PDF document text
    • http://kechengchem.com/upload/files/64571519705.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/pezomigesiwixebipifitija.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/dibabofafirefaxit.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/pavonuluwajedo.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/60386315846.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/1915783691.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/25448426232.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/geworejalo.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/xitobo.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vonenisapesa.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/wopadirokifagarimipajuzu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/31222060873.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/kiduwurunosutuko.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/godid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=assignment+on+marketing+plan+for+a+new+product+pdfPDF 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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 11220 bytes
SHA-256: 58b51a6dbf82ea32200ef82dd4bb2ea031b21ffe8a2e4d717b36d619092367a4
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 16248 bytes
SHA-256: 9474d38f6ebc73680d5c9e80bf0c4d37d57bcb8607a92a8693b1d19539748b8a