Malicious PDF — malware analysis report

Static analysis result for SHA-256 52757d55f631c385…

MALICIOUS

PDF

79.3 KB Created: 2021-03-17 08:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ebef6d54e6eb5f638cc0300f48c18bcf SHA-1: 33c8a2ea8543574d60bc4513c5b0a53105658b63 SHA-256: 52757d55f631c38598488609c094435e2a6c1d531ed786e221abfd8e41d40342
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/wix?keyword=beast+tv+reviews+canada PDF link annotation
    • http://kudezixajuxuni.66ghz.com/berjaya_group_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/UmVMxgi/ignou_tee_june_2019_date_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/acgcVrQ/13051212197.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/salimax_systems__controls_engineering.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/NjcQjdx/monzo_digital_model_builder_apkpure.pdfIn PDF document text
    • http://ratonawe.iblogger.org/what_is_an_innovation_and_planning_iteration_anti_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/chg8hb2/rolling_ball_sculpture_lift.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/4nhj8jb/xotibitaxuzone.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/how_to_start_a_ketogenic_diet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigogejuj.epizy.com/16331448597.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/xenoblade_chronicles_2_salvaging_guide.pdfIn PDF document text
    • http://beturatigamoli.epizy.com/example_of_grading_sheet_in_college.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/ajax_jquery_php_form.pdfIn PDF document text
    • http://bipofixijanafuf.rf.gd/komokejada.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 5100 bytes
SHA-256: 0c2154321900c8ce548735e753a562586d754f1f5ee29877eb1d00909565b69a
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 10796 bytes
SHA-256: 672eeaf382cdf833d1b34b5b7f0f9f96164cf55eb7c6d05b6cff2cf4ecb7ddb3

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