Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5fa95370eb52e8…

MALICIOUS

PDF

74.0 KB Created: 2021-03-18 05:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e84d10842dbda8ed0046f847b99e93c SHA-1: 0804639987fbc6c26f084ec8798df34738ba7e86 SHA-256: 3b5fa95370eb52e87b9966c778a3e9e1d98bb2021cfcb0e58e830d786516c1b7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/award?keyword=muscle+gain+workout+program+pdf'. ML classification and ClamAV also flagged this file as malicious. The document body is heavily obfuscated and likely contains embedded JavaScript or other exploit code, though no specific script content was extracted. The primary attack vector appears to be luring the user to a malicious URL via a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/award?keyword=muscle+gain+workout+program+pdf In PDF document text
    • https://cdn.sqhk.co/noloxunipe/b8jgC7T/vue_js_button_submit_form.pdfIn PDF document text
    • http://raxaterov.iblogger.org/4284357338.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/hjiXhfd/13635652166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesuzirer.rf.gd/rodoweponurama.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/58194484275.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/dbt_therapy_skills_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/microsoft_word_2007_address_book_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/zunegekam.pdfIn PDF document text
    • http://beduxuluwuniva.rf.gd/cradle_to_cradle_waste_equals_food_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/menciona_y_explica_los_tipos_de_sistema_operativo_que_existen.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/duzumadapivepet.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/humminbird_piranhamax_197c_pt_fish_finder.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/makoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/konubuwivujirutowowo.pdfIn PDF document text
    • http://fatekikatamepis.rf.gd/what_does_this_mean_in_python.pdfIn PDF document text
    • http://lovateju.rf.gd/what_is_the_most_coldest_city_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/22871207273.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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5636 bytes
SHA-256: 62d32ff2f7dc467e059d5ff155a476ed25551b813ef53df74ffd93266d61742a
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 10588 bytes
SHA-256: ae718f827b8493a35a8e619560424bdd50b0ae0a07618db8779615672a19d095

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