Malicious PDF — malware analysis report

Static analysis result for SHA-256 548633bff445bf10…

MALICIOUS

PDF

71.4 KB Created: 2021-01-30 13:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 2e55110d780e00043b4072a96dbd3693 SHA-1: c81faccf43c436163a0af264b8aa319562dc229a SHA-256: 548633bff445bf10071b1669f4cd23aebdd8e0acefe408cd71e72ef7e8133851
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary redirector URL, https://jacksth.ru/123?utm_term=biology+lizard+evolution+virtual+lab+answer+key+pdf, is used to lure victims under the guise of providing a document. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://jacksth.ru/123?utm_term=biology+lizard+evolution+virtual+lab+answer+key+pdf PDF link annotation
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/mavovepa.pdfIn PDF document text
    • https://kerozutovazo.weebly.com/uploads/1/3/0/8/130813796/gulizaresut.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/b84c3636168.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/fixogete_nujogagadugofol.pdfIn PDF document text
    • http://limevekobo.iblogger.org/541866153.pdfIn PDF document text
    • https://lapudaxorekoj.weebly.com/uploads/1/3/0/8/130814283/1948395.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/dx1IieF/81941121355.pdfIn PDF document text
    • http://fexuvukenix.22web.org/luzoxelulotakomoj.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/dogazisuze/fitbit_versa_brasil_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/black_friday_movie_free_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/dragon_s_crown_pro_ps4_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/easy_piano_worship_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/vivagorajinadinugebazug.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/9051470361.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/bpc_system_full_form.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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 5768 bytes
SHA-256: 0ba845e6e830f9868c3713c786370b11069507569d775f1f5d8e58d28695302b
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 11152 bytes
SHA-256: 599c84d520c695fef6d58c8c45084ed7f78df838c13f0377de1e400a34b74e18

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