Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ada7f37a7cc5902…

MALICIOUS

PDF

82.4 KB Created: 2021-05-15 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 473469cb46ae39760f3846cc5f08444f SHA-1: 9d16bccb8c42532696e7a1dd1b916e5b1bda0fb8 SHA-256: 3ada7f37a7cc5902ee1c4c4601cde3390bf932f88187e2e36a34171eca92b63c
156 Risk Score

Malware Insights

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

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 0.9993

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 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://pelibifir.ru/strik?utm_term=perfume+novel+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/namulofilox/4teshdz/wood_cutting_boards_cleaning.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/zoHrgdY/hydro_dipping_guns_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/nujusowidom/h72mpBC/28963415473.pdfIn PDF document text
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/biginetalami_dewazuxo.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/batiwuvawafiribodup.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/6757964.pdfIn PDF document text
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/mevikubu.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/UihihfH/invasion_usa_parents_guide.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/geraromu/15204591861.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/29219783236.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/play_ps2_emulator_for_android_jelly_bean.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/82085856258.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/room_interior_design_software_online.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/14_day_challenge_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/fivebenomoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/mapa_conceptual_de_conceptos_basicos_de_estadistica_descriptiva.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/35836827679.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/26968004114.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/33334557285.pdfIn PDF document text
    • http://wesofidufu.rf.gd/37750605543.pdfIn PDF document text
    • http://pavebutom.epizy.com/agendas_2020_para_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/application_letter_format_for_hotel_management_job.pdfIn PDF document text
    • http://megepivafigu.rf.gd/219_bus_timetable.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_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 5160 bytes
SHA-256: 4c3c7af2a540c5fc0eb9f05185b07a64637d7d5681635b9f7a4cea5fbadcd333
font_01_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 10832 bytes
SHA-256: 23136564ade9976439718b3a60d33ab82450ef646de7d8f552d24c5ff9df50d4

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