Malicious PDF — malware analysis report

Static analysis result for SHA-256 064d165d80709d30…

MALICIOUS

PDF

88.1 KB Created: 2021-09-11 03:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c52a262d25c9e3a88c0890257de83f4d SHA-1: 50c41ffb5c883257dcb43d77ffbce193f77435e5 SHA-256: 064d165d80709d30e894df48abf17543d4bb02a2ac7439e87284fc2780d72274
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the idea of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.neoneophytou.com/ckfinder/userfiles/files/96646501795.pdf In PDF document text
    • http://thepokewave.com/uploads/files/xuxiteb.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/levatusi.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/jukomivelifeloxinar.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/wafakurugixefefunugol.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/wipebaloselof.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/sewuravo.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/90280417639.pdfIn PDF document text
    • http://www.siposferenc.hu/html/49226586453.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/37505716097.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/lifagirun.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/jasijubaderusani.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/vowegirujebabojik.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/leridaze.pdfIn PDF document text
    • https://csn-alliance.com/data/files/zerisube.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/2828466533.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/52575134503.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/lesonibomimipefa.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/61661785977.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/35452012291.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907113623.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/93065371583.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28af53511d90ba956c9632d20f9905e0/7573033451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+block+email+texts+on+androidPDF 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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 19068 bytes
SHA-256: a1fd7e0b7b49dca979de13360e3ef5130413dbb0db440a9a7e336b3d7794ff19
font_01_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 10940 bytes
SHA-256: beac706d476e652682fc8c0799b45d5bcef5744ef4a8ec436cf7317ea403f076

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