Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51326d19018c22f…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 02:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ca9365b39d7dd2447095a34d4edb3d27 SHA-1: f69d22e80f659e27689b8b8253e0c9d7bd149763 SHA-256: d51326d19018c22fa0ff09faf393fe8859239974beb2e8334afaf6000a2189c3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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
  • 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.
  • 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://soxebez.ru/award?keyword=distinguish+between+phonetics+and+phonology+pdf PDF link annotation
    • http://yachts-4-sale.com/ratamerejupijolg0kva.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/pejuwotevaputuv.pdfIn PDF document text
    • http://koguled.22web.org/vogebema.pdfIn PDF document text
    • https://zepodafato.weebly.com/uploads/1/3/4/8/134880008/kanew.pdfIn PDF document text
    • http://mapoporikamo.22web.org/filugekowuwuk.pdfIn PDF document text
    • http://feedbacrnz.space/dale_earnhardt_jr_plane_crash_report0064c.pdfIn PDF document text
    • http://mailedflkf.site/hansel_and_gretel_bakery_duluth_menua2dsa.pdfIn PDF document text
    • http://hytri.com/73229741029ti247.pdfIn PDF document text
    • https://dejatenuti.weebly.com/uploads/1/3/5/3/135348415/5152437.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/zutakederigezikera.pdfIn PDF document text
    • http://makamar.online/ludigifemuxogavolynzyo.pdfIn PDF document text
    • https://zajewovebuvi.weebly.com/uploads/1/3/0/7/130739158/8810347.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/2280053.pdfIn PDF document text
    • http://ylyn.ru/most_common_action_verbs_in_englishes6w2.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/4060248.pdfIn PDF document text
    • https://jesefunif.weebly.com/uploads/1/3/5/3/135393529/5706703.pdfIn PDF document text
    • http://yblda.fun/adobe_acrobat_pro_apk_for_androidku2rk.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/temisubesilu.pdfIn PDF document text
    • https://xekelubapakam.weebly.com/uploads/1/3/4/4/134499273/04de23fb.pdfIn PDF document text
    • http://vash-fasad.live/first_alert_carbon_monoxide_alarm_shows_endwfzw7.pdfIn PDF document text
    • http://goldenframecollision.com/8210736266en3go.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunitugi.rf.gd/sql_server_2014_native_client_x64.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_17ab4413ee5e408e8c816bd9d91fa4f6.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_d7edcbd3280e4a8b99c35a5e7ddbffaa.pdf?index=trueIn PDF document text
    • http://wetovokerug.epizy.com/mikimifituxelefo.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_a2e127b1af7f4be6a7c803367fa8a9dc.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_274a11a3c1d645d5aeee1860efd9477e.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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 5656 bytes
SHA-256: f1134dbff6b5c2daaded7411356a1ed89a15d6eca766ecba372913ecb9bcf8fb
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 10484 bytes
SHA-256: 0c4abc96c62cb413bfd34866ea4a493e3bc952c09ad69b4f143b37f40364f258

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