Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e38eff3b380405e…

MALICIOUS

PDF

78.9 KB Created: 2021-01-28 15:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d90e138a270963542ac4c1908e66ef6d SHA-1: e789b6c0a753be1f1a58dfc8d89e8ebfba451369 SHA-256: 3e38eff3b380405e6a977704abbfcf8ef508e7d603a6963a72823232865c5420
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs suggest it is designed to trick users into visiting harmful sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=sotano+de+las+golondrinas+san+luis+potosi In PDF document text
    • http://ig-soft-team.com/the_startup_of_you_downloadq0tlu.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/efucha3/16593913413.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/migowobufowufa5z7k.pdfIn PDF document text
    • http://kosodidaxelo.22web.org/dolphin_management_user_guide.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/9018117.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/baf923171315.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/he8jj0h/wenaxowidalujelemezew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_5fe2e1dee5011.pdfIn PDF document text
    • http://milansit.space/top_boss_fights_video_gamese5jch.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/dRHLhRw/51497163715.pdfIn PDF document text
    • http://gelivebun.22web.org/guess_what_game_answers_flipkart.pdfIn PDF document text
    • http://borutafag.66ghz.com/al_meera_rewards.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/bjakhhk/begexevadet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ribizotujigotok.rf.gd/fosegu.pdfIn PDF document text
    • http://nidikofuwovi.rf.gd/misuwijes.pdfIn PDF document text
    • http://suboxasolu.rf.gd/particle_brushes_photoshop_cs6_free.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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 2884 bytes
SHA-256: e3fff5ee39b5cac5f041111cb582588823540a7511515712f5f7c6ea126d94d2
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 5228 bytes
SHA-256: da130509c7ffd33a859319c8c29659ab229983655600e576b2473b24e90a939c
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 11612 bytes
SHA-256: 07c800d4c26d6f8c5fd99fcf2a1717a9426730de3943c01f3a35bedfc3c7b9c0

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