Malicious PDF — malware analysis report

Static analysis result for SHA-256 4603386306a4bc72…

MALICIOUS

PDF

99.5 KB Created: 2021-03-21 20:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b466b1ba1544ea8972b761570c9a6f46 SHA-1: f4d4d38df2f84f42bc357c84444488d3a52d6332 SHA-256: 4603386306a4bc72bafdd8992921b18e4357558db8d25cfb9f8a7e508df398d6
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document's structure suggests an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/123?utm_term=android+sdk+version+8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_602c5829c22ad.pdfIn PDF document text
    • https://cdn.sqhk.co/fanasuzajem/wMoibje/tedosubivasa.pdfIn PDF document text
    • http://homeolimp.com/fallout_1_guidep2yws.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/hhhfNfZ/38605947558.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/zidRgdF/rollercoaster_tycoon_4_mobile_cheat_codes_android.pdfIn PDF document text
    • http://lonumawewexupo.22web.org/pages_comic_book_script_template.pdfIn PDF document text
    • http://update-win20.online/dojanaviti3gatq.pdfIn PDF document text
    • http://doorstepcomputers.com/75483134319acc70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fd974bf535f9.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/9jgijib/93524135343.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/bxtgSYs/download_beautiful_nature_wallpapers_for_pc.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/tamobalasu/60731456428.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_3ba983a860a045a88a538098039b3516.pdf?index=trueIn PDF document text
    • http://nejotuwusa.rf.gd/lizzo_truth_hurts_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/43583262.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/livro_alta_performance_em_vendas.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/13949209896.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_11bfce1069d24d4bb9608be981f9d50c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/maps_me_apk.pdfIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_31d6d3080f1440d9a0d782f1b61dbc34.pdf?index=trueIn 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_off00014ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADA 4884 bytes
SHA-256: 8f40a7b2171731a4a6a1603857d2f0c5a3c309df24287ce5894945ed1cdb4d64
font_01_sfnt_off00015b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B96 11432 bytes
SHA-256: 6c157b2c4e94f2cae96a75748b9f70e9452583e3117d8d84cb20857e9ba60d6f

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