Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee01f4e688ff748b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 08:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7a1300e27415816e93c5678c96d5923 SHA-1: bc7fc6e2d9dd99433755ab756f3976f368fcab6c SHA-256: ee01f4e688ff748b65cfe9ff93e343b886d5c741513440e09aa9ed00b3241f38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://galaxytraining.examinationonline.com/files/pebosiwivesu.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf7c8b37c---vokefewegobal.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/61392831126.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/81968762175.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/50178031974.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vutanaxuworumiwaj.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/70817122180.pdfIn PDF document text
    • http://guowangcable.com/d/files/vuvatebewozirizosaz.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/jeliguk.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/ganujenugepuv.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2a4adf156fd2420d69a60984926b0635/rurusedodofagirazogan.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/lubejesedu.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/28516049559.pdfIn PDF document text
    • https://titishop.co/upload/files/tetopowixomi.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/54302985295.pdfIn PDF document text
    • http://secoinblock.com/upload/files/55390944438.pdfIn PDF document text
    • http://dges.in/userfiles/file/vifibapixokitasutufur.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/10046572848.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///tuxuxeka.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/pewukenebufurezirewite.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/21354152650.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/buturoj.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/parusogabe.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/nowiluvedudipikaxinefeso.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/14063197305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+lost+book+of+the+white+read+online+freePDF 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_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 17536 bytes
SHA-256: ca436f60264db28fd3f13750a64c296f1b46318a618689494b94ae226eb01b79
font_01_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 10732 bytes
SHA-256: e91445bdf7ebd5408ccbc6d7a70569d4e913ca5339c56a11510e013d34e4c584