Malicious PDF — malware analysis report

Static analysis result for SHA-256 7590e484956ecb26…

MALICIOUS

PDF

81.4 KB Created: 2021-03-09 07:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 327d361af177b07e8b9ea9539608861e SHA-1: 918f442fd09cb9510e39ebbbdaabe3109e345332 SHA-256: 7590e484956ecb266c5611a574fb1ed9f83cc8e8335302216f10f9113dece75b
134 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly suggest malicious activity, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=borodin+quartet+2+pdf PDF link annotation
    • http://madewithsunshine.com/27860133410xsbmz.pdfIn PDF document text
    • http://serarudipiwuvon.mypressonline.com/el_hombre_como_unidad_biopsicosocial.pdfIn PDF document text
    • http://workshop-fb.ru/54539669013sko0z.pdfIn PDF document text
    • http://tabikola.online/fevexasudunibidivejuiy3he.pdfIn PDF document text
    • http://it50discount.pro/dark_crystal_age_of_resistance_ostgcmej.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/hp_laserjet_pro_400_mfp_driver_windows_7.pdfIn PDF document text
    • http://trokot-new.online/31948_du_ciel_ce_bonsall_ca_maplqx6z.pdfIn PDF document text
    • http://instapodarok365.site/312428694025tg1n.pdfIn PDF document text
    • http://pubgmobiie.com/juz_30_surah_pertama9ac52.pdfIn PDF document text
    • http://rubeatyshop.xyz/dysarthria_apraxia_treatment_manualsszed4.pdfIn PDF document text
    • http://zatoboyvibor.fun/732844720010xp6l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mobopufo.rf.gd/dowry_prohibition_act_1961_in_tamil.pdfIn PDF document text
    • http://vifewupanog.epizy.com/27005968111.pdfIn PDF document text
    • http://nogibusap.epizy.com/weather_report_today_gujrat.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/think_of_me_fondly_lyrics_phantom.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_c8d58b532e87400fa7636d09c00d5f47.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_8d34b5ecb47242749988134ed41397d8.pdf?index=trueIn PDF document text
    • http://xogijowag.onlinewebshop.net/76441406962.pdfIn PDF document text
    • http://zuputes.atwebpages.com/how_to_reset_inverter_on_rv.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_49341c7805984284a1f4684be83999df.pdf?index=trueIn PDF document text
    • http://gototura.myartsonline.com/42136360145.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_3006ce1a7e434a2e90f9d03c20a77cc0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 5016 bytes
SHA-256: 2152f88248dcb286535d617022a7736f674988c9aed6691864382af61195a353
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10180 bytes
SHA-256: 3bc20480da24ab3972fb9af256c1601d3e75a1753ea8a205b9f074cb1b4f56d8
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2