Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24be0a8de7bf6fb…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 09:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd8658f06f93e258682ec97be3fbe7c2 SHA-1: d74bbd9dfdb9ddce72116174c702fad92a18c46f SHA-256: d24be0a8de7bf6fb504bc63d93919fae3d5cdaa350462a1ee38508b2e9b273db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users into clicking through to potentially harmful sites, likely for phishing or malware distribution.

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://garglob.ru/uplcv?utm_term=recovery+video+apk+pro PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5c7f9f97f6825cc7d360463b473a5b6a/82888498751.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613acd5ca64b6---58268637580.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/49223862616.pdfIn PDF document text
    • http://wwstationery.com/files/file/wajojifiwufenox.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/5390732190.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-9/20210909151517265318.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/21176326209.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/guxasolepukezo.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/larefe.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/garexaziwapumirirusizu.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/jarazelarabimujarajire.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/xatusebuxejava.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/12085856103.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/letij.pdfIn PDF document text
    • http://kdekdyjak.cz/data/nomugidowowefobimorugorit.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/bexabezuj.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/47513363632.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/wanepejilokazotiposino.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/65165610431.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/59092924651.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/61939958523.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kokibirojodufopibotased.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/denuluxotigukijo.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/dajizasaboj.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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 19728 bytes
SHA-256: a4e8b3313177adc4f94cf1773ec8afe8f4424ba111fb5c635daef3d46255f3a4
font_02_sfnt_off00012c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8B 10408 bytes
SHA-256: 92ec200d99a2f1bec43afc38193b39ffe89dba5dc965b25c87b14546a41f8eac