Malicious PDF — malware analysis report

Static analysis result for SHA-256 92415ef385eb8a65…

MALICIOUS

PDF

156.4 KB Created: 2021-03-28 11:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9d47b30f44d76d145322addcfbc2f8f0 SHA-1: 473774b5bbcfcf2a6bc7675469926bd9c45c4713 SHA-256: 92415ef385eb8a65e9680a42645f595e73dc8ef129f791df0e84b9c28487c699
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 external URIs and is structured as a link farm on disposable hosting, indicating a phishing or scam attempt. The document body, though heavily obfuscated, suggests a lure related to a 'Chevrolet suburban 2015 owners manual'. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pelibifir.ru/123?utm_term=chevrolet+suburban+2015+owners+manual PDF link annotation
    • http://fufexak.22web.org/antiphonale_romanum_ii.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5ff31c1898a7e.pdfIn PDF document text
    • http://vijasoga.22web.org/merge_excel_sheets_into_one_sheet_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_6059d56992745.pdfIn PDF document text
    • http://hamlikjorettoop.ru/vudurn4vd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fe4a2708f310.pdfIn PDF document text
    • http://totudini.iblogger.org/what_is_plot_and_structure_in_literature.pdfIn PDF document text
    • http://micrometer25bill.site/baby_grand_piano_vs_grand_pianon6bvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_600f97248dc29.pdfIn PDF document text
    • http://levantemosaic.com/speed_or_upload_speed_for_gaming0kstb.pdfIn PDF document text
    • http://gnatural.space/best_website_template_for_graphic_designerskn3wj.pdfIn PDF document text
    • http://muldwych.com/ruvuziwono2gkqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_6039e880eea17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_603935a545ccb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rokipegokibaf.rf.gd/creative_resume_format_in_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/what_color_is_close_to_phthalo_green.pdfIn PDF document text
    • http://xujekapowizi.epizy.com/sounan_desu_ka_episode_4.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_0a8ba10380d542d49997b27d09a1cc23.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_0e69eab330124823b5ccf26393c246c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/adnexal_masses_us_characterization_and_reporting.pdfIn PDF document text
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_21cb0d5c32b04e54bd15c3b6bf280244.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/velida.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20206 5524 bytes
SHA-256: 730f17381c15893b6d2e37c3151bc57906dd77e166ad025b82fef7225f50b8c8
font_01_sfnt_off000214c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214C1 12264 bytes
SHA-256: 3eecbbe9e49eef01ef8fd07567418267ef2a82af220cf42a3778519f16cfc7f6
font_02_sfnt_off00023e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E8C 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833
font_03_sfnt_off00025320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25320 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34