Malicious PDF — malware analysis report

Static analysis result for SHA-256 57539ec22d6f3ca2…

MALICIOUS

PDF

76.8 KB Created: 2021-05-11 14:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 51882de6a180035eedb37834c705caa3 SHA-1: b65a8b1c219e7128333d52337d81c918a967b808 SHA-256: 57539ec22d6f3ca209221c9ed278b572aeb23f8c22cce3e64b4125d71af288fd
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The presence of embedded URLs and the heuristic identifying it as a link farm support the conclusion that this document is intended to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/strik?utm_term=grade+5+common+core+math+word+problems+worksheets PDF link annotation
    • https://cdn.sqhk.co/zegareguw/hjd3icB/virus_wars_best_weapon.pdfIn PDF document text
    • http://organize.shop/tujanafubinuzaki5py.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/69435516545.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/cRhjahh/walmart_money_card_green_dot.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/losija.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/kukopuvopigetub.pdfIn PDF document text
    • http://contact-git.top/42050764421zktg8.pdfIn PDF document text
    • http://euroshopmn.space/how_to_adjust_shower_temperature_regulatorfbdym.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ifLtKm3/74496921621.pdfIn PDF document text
    • http://reznitskygallery.com/canula_de_guedeluzws5.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/xomilowofizutuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/hiXCcsi/nick_folk_patriots_kicker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokesakogo.onlinewebshop.net/algebraic_notation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/zidexixajuvaxozux.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/how_to_get_write_on_ipad.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/75814643070.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 5764 bytes
SHA-256: 6b80e7a823a915310fc9aa2d1134449dcfdcfe2163b8f5ae801e457d82261cd1
font_01_sfnt_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 11180 bytes
SHA-256: 874e7f2c7a8300ad8f89b3cb3f5a2d5937b6404219d81dd172dcc8ffb0380e53

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