Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7576fb470b03d3a…

MALICIOUS

PDF

91.0 KB Created: 2021-02-26 14:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab91bde863b4d4313b8e05d98055f07c SHA-1: 8fba2c72f832b438a79c9755de7633f4b3081b5c SHA-256: b7576fb470b03d3a34b79da41e528c5df308e51d49f5eae6c8c1e7a26cdfdef6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=rowenta+microsteam+400+manuale+d%2527uso PDF link annotation
    • http://reduslim-sito.site/los_lobulos_cerebrales_y_sus_funciones41t9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fdeb2138f626.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/algebra_2_common_core_textbook_pearson.pdfIn PDF document text
    • http://save50.pro/keralizy7hrk.pdfIn PDF document text
    • http://help-ruleviolation.com/89691012748fnhyc.pdfIn PDF document text
    • http://medyayazilimtr.com/kupumetezakuli5wn.pdfIn PDF document text
    • http://mx50off.info/pebomebezutodufaswpxc8.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/89608004456anghc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415769/normal_5fddb14b23a37.pdfIn PDF document text
    • http://hightrade.club/jewuwogill6d68.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/mastering_the_art_of_french_cooking_volume_2_recipes.pdfIn PDF document text
    • http://operationhomeplate.com/925915793644bb7c.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://vezuzatutuxi.epizy.com/math_models_with_applications_answers.pdfIn PDF document text
    • http://litorow.myartsonline.com/simple_russian_grammar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 5332 bytes
SHA-256: b80f7f29f2c3e01fcd24e8fd19a6a3e4bc668cbb6cf776a304afe9a0f950f635
font_01_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 10756 bytes
SHA-256: 140f12d22e4e358662a4e9abadcc868f4e6a69687f315e6dd949aa0438d85600
font_02_sfnt_off00015045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15045 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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