Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f50bd264226bb9e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-23 13:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d6c23c805dc6ecef499d9edaa932ee4 SHA-1: 8ed717712f2b52711da1387b01e08d2b93e358f3 SHA-256: 6f50bd264226bb9e1932477987fd8634dda851bc1c7f0722689df9cfe764b4ad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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 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.
  • 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://nipisod.ru/123?utm_term=android+change+toolbar+back+arrow+color PDF link annotation
    • http://islandlandscapesbb.com/warrior_cats_ebook_free_downloadh39d7.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/cFygfje/56911103008.pdfIn PDF document text
    • http://goodik.fun/greek_to_english_bible_translation8asev.pdfIn PDF document text
    • http://affilateapp.online/11308833024gctx6.pdfIn PDF document text
    • http://fortuneo-enligne.com/gojatibogoc2x3j.pdfIn PDF document text
    • http://shopeuro.pro/clasificacion_del_derecho_procesal_penal_en_mexicoe2hoh.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/aieXzS3/manual_ar_condicionado_lg_dual_inverter_12000.pdfIn PDF document text
    • http://gamedv.design/angular_8_tutorial_espaol5rgbh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5fd1b3822b059.pdfIn PDF document text
    • http://topsale.pro/boat_conformation_axial_equatorialkm1r8.pdfIn PDF document text
    • http://wowmarket.info/best_buy_ipad_pricesoik85.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/gihg13C/cinelux_theatres_gift_card_balance.pdfIn PDF document text
    • https://cdn.sqhk.co/tigepukeri/ypghhgb/ti_liu_google_sheet.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/vepim.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/4728261.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/AAhhjdB/text_message_sound_not_working_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/13hbiaH/black_dragon_boba_tea.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/ibibhaY/multiplying_fractions_worksheets_fourth_grade.pdfIn PDF document text
    • http://zahlungsservice-ch.site/waselefoneximujesomafw5zn2.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/d8hajaL/128153466.pdfIn PDF document text
    • https://voganesabif.weebly.com/uploads/1/3/1/1/131163538/e951581c8cbdba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_60512cff5f367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 5308 bytes
SHA-256: 7ad25c6492f5defb83e9a6d3f8ada1fe6845ec89c673626816261e9b463334cc
font_01_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 11280 bytes
SHA-256: da3c3f7b886990175f671e848368ab73602ac108e666d686a4d7490fc88cab51

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