Malicious PDF — malware analysis report

Static analysis result for SHA-256 a276e4c7774f3704…

MALICIOUS

PDF

78.2 KB Created: 2021-01-20 18:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 844a30e875ba34fa0adc37e8027d2d55 SHA-1: 38a6db026cf812dea9a673c9071039054cdde020 SHA-256: a276e4c7774f37042fc3f39fadde6fd3b5c89968582c41af58d0bbd465ab5734
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://gettraff.ru/123?utm_term=heian+shodan+%2528step-by-step%2529'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document body is heavily obfuscated and unreadable, but the presence of the malicious URL is sufficient to infer a phishing or malware distribution attempt.

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://gettraff.ru/123?utm_term=heian+shodan+%2528step-by-step%2529 In PDF document text
    • https://site-1175108.mozfiles.com/files/1175108/sebuwibiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5ff0466b52a5c.pdfIn PDF document text
    • http://kurekarer.22web.org/free_acymailing_newsletter_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476577/normal_5ffc6a5a9b3f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_5fb66f0b98720.pdfIn PDF document text
    • https://site-1177810.mozfiles.com/files/1177810/hypertension_guideline_management_algorithm.pdfIn PDF document text
    • https://site-1180490.mozfiles.com/files/1180490/alien_shooter_2_cheats_for_android.pdfIn PDF document text
    • https://site-1184682.mozfiles.com/files/1184682/commander_legends_collector_booster_contents.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5f8e05993c0cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuduzukatej.epizy.com/60553063218.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/any_audio_video_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/wacom_cintiq_27qhd_touch_manual.pdfIn PDF document text
    • http://ruzuvune.epizy.com/fibexitufufikevo.pdfIn PDF document text
    • http://rovunebezub.epizy.com/noun_adjective_adverb_clauses_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/sijadipupemabavirozabusa.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/16885977575.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/32737015685.pdfIn PDF document text
    • http://ketaxesam.epizy.com/18876640634.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/isaac_physics_answers_b5.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/acer_projector_h6510bd_manual.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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 5308 bytes
SHA-256: 8636462670a5ceead94234cf5c123e0102192be629bd2ad5996326e14798ad95
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 10572 bytes
SHA-256: 0b5c7a2bfbea5e5f8c77bfe66f972244bc999cf08d365ce86360a0a1f9e35966

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