Malicious PDF — malware analysis report

Static analysis result for SHA-256 5756c162f1fcb058…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 01:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e0516f362905b24ea3b56b78ba38c90 SHA-1: 59a861e6fa8728c6660ff628a7348591c35911cb SHA-256: 5756c162f1fcb058d747f47de020c3595a2b8211fdb06c047d71b699a442bdf6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+to+type+spanish+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459929/normal_5fd7a5bc41b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_600ece169face.pdfIn PDF document text
    • https://dudefusuze.weebly.com/uploads/1/3/4/6/134628774/7c914029406592.pdfIn PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/mapumufonaredaf.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/aqhjHif/stick_fighters_game.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/UhbhhAd/batman_animated_series_toys_guide.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/cessna_172_preflight_checklist.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/liver_cirrhosis_complications.pdfIn PDF document text
    • https://sapobukemofox.weebly.com/uploads/1/3/5/9/135974899/562328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_60136808d19b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_6016f314d1373.pdfIn PDF document text
    • http://naturmilans.fun/507111926892n2wp.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/tabla_de_conversion_fracciones_de_pulgadas_a_milimetros.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/rusuwadesufamamok.pdfIn PDF document text
    • http://kobazugipodiv.medianewsonline.com/descargar_operatoria_dental_barrancos_5ta_edicion.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/68e75f5392b8c2a.pdfIn PDF document text
    • http://izzzaaa.space/adornos_regalos_navidad_manualidadesl9356.pdfIn PDF document text
    • http://vk-settings-change.online/45536959018izz28.pdfIn PDF document text
    • http://biomanix.best/997975009767jo6e.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/light_novel_overlord_volume_9_sub_indoiqlv4.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/dazuxujepov/13812381927.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/cartoon_video_mp4_3gp.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5144 bytes
SHA-256: f1126508e994b1156f2723fcc8a71122e9e231a9ed5e98036c819f908ede1ac8
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 13968 bytes
SHA-256: deb93c3ed4e8b2445fd43895dc1b40066be460af988d2847cfd0156428b9b815

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