Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05e675f35880147…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 11:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa4238f6edc5168e87c99291346eaffe SHA-1: c2add203cdff8807542233da5e65465a378515e9 SHA-256: e05e675f358801472598eb3682ec5435651a799ee6b6f84ee0a437e52148ec82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to direct users to malicious content. The presence of `utm_term` parameters in some URLs suggests tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+2+episode+11 PDF link annotation
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/xedabevinixefizugotuwev.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/86983950456.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/piwezarigojasa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///janerujomalebo.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/3659163385.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/84581586315.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210906_205353.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/serevokusirinutiregi.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/18046313083.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/332d75c4d59094f475a8b04ab760b2f0/8666222601.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/kosar.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/zegazifawukixapurujikaz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/91846942510.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e68a1dcc6---18622919645.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/96055009552.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/2575974760.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/94135147615.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/97674998838.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/rosojasikufidawakolo.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/58849446490.pdfIn PDF document text
    • https://laps.pl/userfiles/file/21050099731.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zegubaziwovafapubokibev.pdfIn PDF document text
    • 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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 11104 bytes
SHA-256: bf292bce2d46e424d17799041afd079bf7234eee21c5fc53c9c0db1454204e50
font_01_sfnt_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 18976 bytes
SHA-256: c0a7065553eb84d39531a28a9da17f7b30875e417e0c24af571625df4304f9c0