Malicious PDF — malware analysis report

Static analysis result for SHA-256 b611601027725578…

MALICIOUS

PDF

82.0 KB Created: 2021-02-26 08:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d17286e050d865eebc65cdbf371d8619 SHA-1: 3ec80f532a0e77734451634d708637f652cefb1b SHA-256: b611601027725578d1f8c7074548959cab106d7408fdfe4bca4e816463074585
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the PDF is designed to redirect users to malicious websites, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=stihl+blowers+for+sale+on+ebay PDF link annotation
    • http://my-favshopg.online/esl_reading_passages_beginnerwc59n.pdfIn PDF document text
    • http://italia-doc.fun/taller_de_escritura_creativa_berta_hiriarthqt2l.pdfIn PDF document text
    • https://rikisefunem.weebly.com/uploads/1/3/5/3/135337995/8308402.pdfIn PDF document text
    • http://artelamp.store/xonazovi20fvm.pdfIn PDF document text
    • https://xokizaneg.weebly.com/uploads/1/3/4/8/134886830/5550199.pdfIn PDF document text
    • http://dazipuv.iblogger.org/rodixijegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_60097c1cc774b.pdfIn PDF document text
    • http://tukameduk.22web.org/muxapomijujopufikokizuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60114a4704595.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/rival_20_quart_programmable_roaster_oven_directions.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/how_to_make_an_assessment_plan.pdfIn PDF document text
    • http://vapovefov.epizy.com/pumerogadifabudopemogunaz.pdfIn PDF document text
    • http://mivazofirogo.epizy.com/adjectives_lesson.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_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 5292 bytes
SHA-256: 9e29c490fcff384c416521ea7615d6445a261d7ff7ac4d5cecf33696bcfb798f
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 13168 bytes
SHA-256: cba81b0bc0d58023629793655712e69588f2ade0f7d3b0d23a934a22d7c702b0

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