Malicious PDF — malware analysis report

Static analysis result for SHA-256 868280ae08d879ee…

MALICIOUS

PDF

80.1 KB Created: 2021-05-01 06:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9653afa81ecf8163e1b006394c3fb90f SHA-1: 678e6ed2592e4baee79cfc404477fcce6acfd99e SHA-256: 868280ae08d879ee0cc06df0f11bad9859a8e1ef6950827964490001e5249754
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=words+that+start+with+nip
    • http://zifufarox.getenjoyment.net/68705253643.pdf
    • http://duplicwcnj.space/20883766790zyhnv.pdf
    • https://nipixejewawowe.weebly.com/uploads/1/3/0/8/130874539/kopobepodug.pdf
    • http://cooldomen.space/2310672709qp6kn.pdf
    • http://fuvesozufinefi.medianewsonline.com/excel_2020_full_tutorial.pdf
    • http://taher-tcac.com/599368178003k0qm.pdf
    • http://falorilipeb.mywebcommunity.org/calendario_2020_descargar.pdf
    • http://help-verifiedbadgecenter.com/kirov_reporting_red_alert_25v5p6.pdf
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/8999348.pdf
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/6713332.pdf
    • http://soul-felt.com/judeduteweluvolemosogfcy23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luropiw/up_btech_online_form.pdf
    • https://s3.amazonaws.com/sezewu/godemuvonarelakekazuxowun.pdf
    • https://s3.amazonaws.com/bitajemisajoz/24189357350.pdf
    • http://pisonepegosa.myartsonline.com/character_traits_list_3rd_grade.pdf
    • https://s3.amazonaws.com/vazisi/35782624037.pdf
    • https://s3.amazonaws.com/gazijewevan/sugegewe.pdf
    • https://s3.amazonaws.com/ganubifirigevi/how_to_do_ruqyah_on_someone.pdf
    • https://s3.amazonaws.com/mogedozara/g_shock_rangeman_watchshop.pdf
    • https://s3.amazonaws.com/sikuva/vitidufisexanir.pdf
    • https://s3.amazonaws.com/tometubufimopim/thinkorswim_canada_pricing.pdf
    • https://s3.amazonaws.com/tugabijenovili/self_help_couples_therapy_worksheets.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/clockworkmod_recovery_v5._5._0._4._tar.pdf
    • https://s3.amazonaws.com/rurosaveruk/wordscapes_answers_level_806.pdf
    • https://s3.amazonaws.com/juzewojavomofew/63476724390.pdf
    • https://s3.amazonaws.com/gapivegek/fotelow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdd.bin
c4d1e43780f9a3924c0c8a003aec7ffe73d479c05c5910fb239df5eb6bf1b139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 5120 bytes
font_01_sfnt_off00010d58.bin
876a866efbe5ed88d104246bcff7ae333545bce022eff8a1380f769ae95f99c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 10884 bytes

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