Malicious PDF — malware analysis report

Static analysis result for SHA-256 c571f237155aa62a…

MALICIOUS

PDF

75.9 KB Created: 2021-02-21 05:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ac7e0245b2cf15de6972b12731c884b SHA-1: 516abd725739fa7a374074a90f3b699b9e8174ca SHA-256: c571f237155aa62aa07556988f87d4ac9866c047b2b1d48ce1821ff49c26436d
186 Risk Score

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 0.9998

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://jottigo.ru/wix?keyword=words+starting+with+letter+g+for+kindergarten PDF link annotation
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/4559432.pdfIn PDF document text
    • https://manapefowuv.weebly.com/uploads/1/3/4/6/134605974/2f3fc1abe9598e.pdfIn PDF document text
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/dikali-kazivokaro-rimalonepa-zediladuguzi.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/734c500.pdfIn PDF document text
    • http://vedibekupuviru.iblogger.org/dowuv.pdfIn PDF document text
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/5334228.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/rubed-vetivorixikaxug-wewazafegegos.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/vutiz.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/bodigi.pdfIn PDF document text
    • https://rirokenu.weebly.com/uploads/1/3/5/3/135349909/wimefavefekimufobofo.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/hiiebji/school_management_system_using_linked_list_in_c.pdfIn PDF document text
    • http://bufukaw.iblogger.org/wills_lifestyle_near_me.pdfIn PDF document text
    • https://musonilemif.weebly.com/uploads/1/3/4/7/134752032/1569805.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/f0b1426d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pigafutuvip.rf.gd/jebagibabowonazupupomeve.pdfIn PDF document text
    • http://muxajetolalet.epizy.com/jasper_report_studio_6._5._1.pdfIn PDF document text
    • http://gevegure.rf.gd/fire_drill_report_form_template.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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5340 bytes
SHA-256: 006d5d0e21041bf68585b6f332abaa93518c75a192a8642c869825eb98764aba
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 10576 bytes
SHA-256: cce7cb01dad3fadae697687ece160b1b613de1264441c3d8306747344276330b

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