Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a15638ae182310…

MALICIOUS

PDF

71.0 KB Created: 2021-02-12 20:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0972490305ec9aded4339fcd7a6a3828 SHA-1: 731160d8ae303372e35a311a1fb310518c689eb8 SHA-256: b6a15638ae182310916c37656d0bc920902a41dd9479fb9f3c8326965ee7bba8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely part of a phishing campaign. The document body, though heavily obfuscated, appears to contain system-like messages to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=your+startup+disk+is+almost+full+mac+erase+free+space PDF link annotation
    • http://pejofewetoz.22web.org/early_reading_skills_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/hcGg1jc/18531170771.pdfIn PDF document text
    • http://ribuvegiruni.iblogger.org/36355945961.pdfIn PDF document text
    • http://remontvorot24.com/pojuxetikeg5l.pdfIn PDF document text
    • http://montana-media.com/8500299008173qvx.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/biejhig/online_mobile_recharge_idea_amazon.pdfIn PDF document text
    • http://pimipaxu.22web.org/cdr_viewer_free_for_windows_10.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/dinilederu/coal_india_sustainability_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/miwuduzur.pdfIn PDF document text
    • http://lojogonofar.rf.gd/math-_aids_combining_like_terms_answer_key.pdfIn PDF document text
    • http://kidewidenidoze.rf.gd/ragnarok_m_bard_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/varicela_zoster_en_adultos.pdfIn PDF document text
    • http://dimazobuxijema.epizy.com/blank_kanji_practice_sheets_printable.pdfIn PDF document text
    • http://zapofekeba.rf.gd/riledafinovisolomofanex.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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 5328 bytes
SHA-256: 2588a694932cd478d6d1483868b9363c197cafa428f09d2cafd06edb0857cb2a
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 10592 bytes
SHA-256: 393aaa20b2eeb00cff33b94e6fa6bcdc315d3e33319609bf64b521f0435dabcd

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