Malicious PDF — malware analysis report

Static analysis result for SHA-256 522d69bedb97442d…

MALICIOUS

PDF

84.0 KB Created: 2021-03-01 02:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a5f0284306f9fd9203c0fc67652c3086 SHA-1: 17f37840eb946803c01ea51ffcd58c5b35b5c8e1 SHA-256: 522d69bedb97442de1766f2f21b387adb25a4099c6fa6e6f451ab82fcb3ab13d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=lg%20g5%20vs%20moto%20g4 PDF link annotation
    • https://cdn.sqhk.co/bulegumu/fhjjcwT/gosolisopurizisujoranuk.pdfIn PDF document text
    • http://lifeshop.pro/3509569522215siw.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/3658455.pdfIn PDF document text
    • http://crispyset.online/zuloginagijqqeg.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/jiihidU/68510436601.pdfIn PDF document text
    • http://onatural.space/249939261619jo7o.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/fjacqjb/sevezu.pdfIn PDF document text
    • http://badgesverified.com/38063085397hvfdb.pdfIn PDF document text
    • http://cuzinfo.ru/13572288215iwg5q.pdfIn PDF document text
    • http://mysteps.online/584094373307mb5r.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/4oxfoia/car_simulator_games_for_pc.pdfIn PDF document text
    • http://erogan-columbia.site/apex_launcher_apkpurezye2z.pdfIn PDF document text
    • https://cdn.sqhk.co/gonaxetuped/gcqOOGp/76221931136.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/litunux/schubert_impromptu_op_90_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/36405923490.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/virarisoforobida.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/niwejupofugowiganipemi.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_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 4880 bytes
SHA-256: ccca70240b4877de0c2cc5f985f42dce8f602c7d017b6efc2afcc4fa7ffc47eb
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 13296 bytes
SHA-256: 3c1f6dc934cf1b49eebdc34ef599212ce504f08230ca7639f5ca8238ca8b259d

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