Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb87208a6fc6d497…

MALICIOUS

PDF

100.3 KB Created: 2021-02-14 05:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bba79464f1947448e7f1e69c544b2a96 SHA-1: 1d711f743e2e920c219589b89886148c10c65899 SHA-256: eb87208a6fc6d49710897bd6fa63cc182859744de28f524b76279cf56bc4f5cd
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'crophysi.ru'. Another critical heuristic indicates a PDF link farm, suggesting a tactic to manipulate search engine results and drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/wix?keyword=vocabulary+power+workbook+grade+3+pdf In PDF document text
    • http://ctyr.ru/us_visa_interview_questions_b1_b2sf0vm.pdfIn PDF document text
    • http://4gusevshop.space/adt_pulse_app_camera_not_working9x9mo.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/8c3bed9798db7b8.pdfIn PDF document text
    • http://prizinsta365.online/vijesisugogomelo4ckx.pdfIn PDF document text
    • http://agent-spv.space/university_physics_14th_edition_solutionsg1ukf.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/5162232.pdfIn PDF document text
    • http://starkrobotics.org/94897470953m3bm9.pdfIn PDF document text
    • http://my-favshope.online/805172629814fika.pdfIn PDF document text
    • http://kernig.store/car_stunt_3d_mod_apk_android_1w92i3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukutud/widuladites.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/car_log_book_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/dc_universe_online_powers_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/replace_us_consular_report_of_birth_abroad.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/alarm_manager_not_working_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/89265985407.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/26459541758.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/11828348335.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_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 3320 bytes
SHA-256: 2881f54add87c90d3c4e9c6b13bf287605d74f03519d1986ceb5c76192ed4154
font_01_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 5672 bytes
SHA-256: 078e4818961e3ec82cd0eb0102868fe769c9891987ee887348159cf3b22130a6
font_02_sfnt_off00013db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB7 15128 bytes
SHA-256: 4c38538546a5376565cbb9bd1d37775cc9cdf6644227cc61f8fd1842de3e9dc9
font_03_sfnt_off00016d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D97 16248 bytes
SHA-256: bc1f90ec93a61a8a37e138ac2c1881ab8e6be204d886a814f7d6e5f76f53d52b

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