Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c748f175e51ba6…

MALICIOUS

PDF

68.3 KB Created: 2021-02-11 12:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 23a635045a7768c23d1d8117868b3e06 SHA-1: 700a0147b3026767dedff809a5be4be47febe153 SHA-256: e4c748f175e51ba662c8b2daf16c2efe89693bfc5e7520241c009a3b87cc635e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

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 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.
  • 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://seumenha.ru/123?utm_term=pdr+for+herbal+medicines+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/levuzivanu/yYmGicy/bajidobetusuwejudirowaka.pdfIn PDF document text
    • http://starkrobotics.org/tepegoxik3ite3.pdfIn PDF document text
    • http://znakomstva69.space/bull_trout_lake_idaho_fishing_reports91jq.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/bojek_nulode.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/fepulavubemokure.pdfIn PDF document text
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/judajukixotul.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/SJSCOig/dotugivibixegumupil.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/d5gevNp/best_wallpaper_hd_frogs.pdfIn PDF document text
    • http://rukozhop-guide.com/bula_kukura_odia_songrddja.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/MtdrXhb/lowusozekabol.pdfIn PDF document text
    • http://devlp.design/kepiluwesfyn0n.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/gebukil/95381247251.pdfIn PDF document text
    • http://fategag.rf.gd/jarisanapibagofibora.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/los_sauces_algernon_blackwood.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/pneumonia_anak_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/epidemiologia_clinica_panamericana.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/4826368955.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/cara_video_di_facebook_android_online.pdfIn PDF document text
    • http://zoregok.rf.gd/6185447090.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/negative_and_fractional_indices_worksheet.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_off0000cbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 5628 bytes
SHA-256: 672914c5e4b5e519c9e7fd078e1445514a0830a06e9ac79f97d993759511ca6b
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 10760 bytes
SHA-256: 99436e151a8d60e6ca5652fa72e5401064977a192f96472ada10e33b8b980dc7

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