Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04d2021914270f4…

MALICIOUS

PDF

78.1 KB Created: 2021-02-27 16:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5c4e969f68a6b9c2ba27cd816b8b4403 SHA-1: d0ef20623ae58f0acc14eee236c0a1cdb24c2a6b SHA-256: a04d2021914270f4499efc475ee6203e1aab1058a47c3e8eb072024b8731981d
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with many pointing to disposable or unknown reputation domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the detection signatures point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/wix?keyword=physical+science+conservation+of+energy+worksheet PDF link annotation
    • http://lobulezinovux.medianewsonline.com/67001958833.pdfIn PDF document text
    • http://edapog.online/32121648996e9oq6.pdfIn PDF document text
    • http://bluebadge-support.com/american_english_file_starter_teacher_s_book_downloadcucbp.pdfIn PDF document text
    • http://amandeepsadyora.com/534172309605g9jn.pdfIn PDF document text
    • http://wujasoxi.22web.org/how_to_enable_airplay_on_yamaha_receiver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_60261fbce9113.pdfIn PDF document text
    • http://kungfumalibu.com/daewoo_g25e_forklift_manualmyu4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444092/normal_6005746cd4d17.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/kimexezapulatejomoweksjfc9.pdfIn PDF document text
    • http://onlinekartiadesi.com/tavublqcfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_5fd93c0f29711.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/Qjggjje/2765338055.pdfIn PDF document text
    • http://chisto-chisto52.ru/slides_themes_and_powerpoint_templatesqcrx4.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/IjahdK8/download_game_stickman_slayer_mod_apk_versi_terbaru.pdfIn PDF document text
    • http://gonzo-3d.com/38556594554gtdhy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487897/normal_60338a714a40b.pdfIn PDF document text
    • http://idealicaitaly.site/32298773227uhr4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miganuvag.myartsonline.com/92904243936.pdfIn PDF document text
    • http://pigepitusedotet.rf.gd/tifovuzavuvonefaperaf.pdfIn PDF document text
    • http://xutarefes.epizy.com/android_one_devices_update.pdfIn PDF document text
    • http://xofaxozewodaf.rf.gd/21976129354.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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5464 bytes
SHA-256: 5a2893bf9a211a401fd86041e1700d89786161fadfaea51422bfabaef7d1e612
font_01_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10760 bytes
SHA-256: b302ca3cb15fcfc789e1df37c0278a3d127b0b396aed8dfcc1200dc0da3b11d6

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