Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d418fd604a3b26…

MALICIOUS

PDF

78.7 KB Created: 2021-03-13 22:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cc266444dc0436db0e994dda1dabf66a SHA-1: abfcbc083acc7ec2914e84ba3aa8e198fa82b27a SHA-256: 73d418fd604a3b26ccf4f8304184f6853369afa01cc2c285e489d86fbd9ff1de
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 part of an SEO link farm designed to redirect users to potentially malicious content. The primary lure appears to be educational material, as indicated by the URL containing '9th class chemistry notes pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://vilenefex.ru/123?utm_term=9th+class+chemistry+notes+pdf+karachi+board PDF link annotation
    • https://s3.amazonaws.com/daxemo/monthly_budget_spreadsheet_printable.pdfIn PDF document text
    • http://mijakaku.iblogger.org/94418496361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_601eb8b5a42fe.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/poe_beastcrafting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/assassin_s_creed_odyssey_dlc_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fe1ad902f954.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/pedurojukavixopakafo.pdfIn PDF document text
    • http://xuxesuvetazu.22web.org/10442460384.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/filmywap_boss_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/84686357345.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/metabolismo_tv_libros.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/46701654422.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/9062771130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_600c6d58b4486.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/age_calculation_tricks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5fce55a017ccc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5feb4a20f3e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_60295f1f95801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5ff7d625321e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_6028b37b470c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_bc36cd845275484788cb9905df46657f.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_bd960732ad7a456f9c329784c3f0d01e.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_42abcc1a4fd24c16b1dbe31bb1e48704.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_788b2cc34d414a219a5b9cea32721fd1.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_9a80ca7df5cf43fbabf34768df37c70c.pdf?index=trueIn PDF document text
    • http://wedutatitupaze.epizy.com/corona_renderer_2._0_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5548 bytes
SHA-256: 683623a50bd2739c9c83e58dae914ec5f75c3fd1aaa98c46b96194a710fad354
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10160 bytes
SHA-256: 9f136c828e1507fcf7d6a7f47b7576ced15ebc7e860171fa4901026b824fe45f
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34