Malicious PDF — malware analysis report

Static analysis result for SHA-256 504f8addd04b6506…

MALICIOUS

PDF

75.2 KB Created: 2021-04-07 21:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38ee793354a3bbfa37c8a4866dfb9ba0 SHA-1: c16ae3d8cccfd8f20450a22a42f83ffc828d6643 SHA-256: 504f8addd04b65066fdb0e39fc09068f562778c97e2e42cbd0fb26a55c7b5d78
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious sites.

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://gimoguvi.ru/strik?utm_term=foxconn+g41+motherboard+vga+drivers PDF link annotation
    • http://cetapp.xyz/19369803043qzmxi.pdfIn PDF document text
    • http://hookup673.site/99038812043e2kq4.pdfIn PDF document text
    • https://kikezisukoka.weebly.com/uploads/1/3/5/4/135400991/zowoganalo.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/hZgjxqO/2694174111.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/jcjjHEZ/66380513124.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/rainer_maria_rilke_book_of_hoursvcpr5.pdfIn PDF document text
    • http://krepezh.guru/how_to_turn_on_baseboard_heating_system45ysr.pdfIn PDF document text
    • http://antonioit.space/rancilio_silvia_parts_listyaf8h.pdfIn PDF document text
    • http://nukels.xyz/what_is_the_purpose_of_sentencing_offendersb3qf8.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/relatrio_de_auditoria_financeira.pdfIn PDF document text
    • http://sayseedokg.com/sogitepuluwadexilami5av9.pdfIn PDF document text
    • https://cdn.sqhk.co/lewogasatiwu/jHRijjh/best_action_games_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/c8Qibgg/backpack_mod_for_minecraft_pe.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/momasopulijo_zukugogej_bowiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_604f34bb23078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_60205fd393b17.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/ujghghz/nusadiliwuvupapufozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477387/normal_5ffbb2f5dbadc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifilow.onlinewebshop.net/gettysburg_speech.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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 5684 bytes
SHA-256: ea7725e1e39b62d7a28e3086d56ee170a23a32007b3817129fadbf23205165b2
font_01_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 11576 bytes
SHA-256: cf34f93c9a9979552721b4137cdd20402a287c794821b97448ec13dfe43f4127

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