Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b3e2e04ba1e8b1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 07:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d86e15224cf96be7a1bcb73d6daf45d3 SHA-1: 70660942dea2220ad36fd2f35622e0b8e4dea7bb SHA-256: e8b3e2e04ba1e8b15fa0df53f62fb622653748fadfc74a32e06991f5bbb6ea86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL `https://pistant.ru/uplcv?utm_term=how+to+check+earphone+settings+on+android` appears to be a redirector. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=how+to+check+earphone+settings+on+android PDF link annotation
    • http://bitree.net/ckfinder/userfiles/files/70205856314.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/90249710453.pdfIn PDF document text
    • http://velisend.ru/photos/file/rinegeje.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/23857128578.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/segavowazesilofotot.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/32350980040.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/biduse.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/78157800297.pdfIn PDF document text
    • http://dhf-china.com/d/files/lijutokojusujekonovegokuk.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/jofejoruxuka.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/38040495304.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/loweno.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/nosenepesejezumuverexoj.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/3552715998.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_86B6BC30EE58C6BD.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/5062514638.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/55888958145.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/m9to24ba0s28c5rv0pjcjuj5mu1je3ct/51340183669.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pobazonusevoxiwajegilajaj.pdfIn PDF document text
    • https://redac.ch/upload/xofik.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/degilidumo.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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 17996 bytes
SHA-256: 2444e76dedab99679b83dedc9abc7e6a3b2e5965b56143be6bb6a89977e29ba4
font_01_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 10916 bytes
SHA-256: 2d412c38a8e0ab6630ae6e53b3dea1d73574a4759a4cc22e17f8bdb132a97e60
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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