Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5a79404afd053d…

MALICIOUS

PDF

74.7 KB Created: 2021-02-16 19:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 92ed37a85ae164f99ecfac44a6c38f26 SHA-1: 4b4bb125e4821a2ef94f7507f80def1d8e372b1f SHA-256: fb5a79404afd053d9321b166d4ba6a5d0964d0ac26017ebaaa251eb600adcd64
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and redirect to potentially malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The primary redirector URL is 'https://baarspo.ru/123?utm_term=how+to+insert+hard+return+in+excel+cell'. Although no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=how+to+insert+hard+return+in+excel+cell PDF link annotation
    • http://lnstagramcopyrighthelps.com/93187106502bqo54.pdfIn PDF document text
    • http://pink-echo.club/7258912131122wje.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/6160151.pdfIn PDF document text
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/20c491af3f37.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/7010533.pdfIn PDF document text
    • http://kyhni.site/despacito_sheet_music_violin2cja8.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/zanizesog-tobusi-jijujesolexumax.pdfIn PDF document text
    • http://axecheat6.xyz/perevoxanubedenecem1w.pdfIn PDF document text
    • https://dujililapute.weebly.com/uploads/1/3/5/3/135347223/jetesutigiwuzituni.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/0263d.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/fadobirak/maplestory_cygnus_knights_guide.pdfIn PDF document text
    • http://fatewazut.epizy.com/hollywood_reporter_top_film_schools_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/nijinuvediruxizod.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/balanopostitis_causas.pdfIn PDF document text
    • http://dokozew.epizy.com/google_sheets_amortization_schedule_with_paydown.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/laveviwipezezugogo.pdfIn PDF document text
    • http://tiriburud.rf.gd/vesupez.pdfIn PDF document text
    • http://gigapexolazet.rf.gd/gojutewajuzew.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/antologias_ejemplos.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_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 5148 bytes
SHA-256: 94e0a759b1c6182543ae13b2d37410c2e8a0969226898bb71f2ef48384cbd066
font_01_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10192 bytes
SHA-256: bcd1eca86111112c7f148267399b3fa01c08aba24ee7db19354e2f6a3b181d9d

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