Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3fe4117328a794…

MALICIOUS

PDF

71.4 KB Created: 2021-02-21 13:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 1fae7275020fbb418f345181e889522b SHA-1: 37847f30ce8996f7b3c895695cdb1c80286ba155 SHA-256: df3fe4117328a7940e407c72d88de259a7ebc5c5c9d3dfa4865099df50dd7635
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on disposable hosting to obscure malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the phishing detection strongly suggest a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=super%25E2%2580%2599s+life-space+life-span+theory+key+concepts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382190/normal_600610a361c68.pdfIn PDF document text
    • http://natlab.ru/les_bonnes_pratiques_de_fabrication_dans_l_industrie_pharmaceutiquehgmm6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_60068e724040f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_6025458d879ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366961/normal_5fcbff96d5e54.pdfIn PDF document text
    • http://raruranakadup.iblogger.org/403085793.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexikewilupime.rf.gd/divine_comedy_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/how_to_deselect_all_sheets_in_excel.pdfIn PDF document text
    • http://vukigopi.rf.gd/psx_iso_cdromance.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/balance_sheet_budget_vs_actual.pdfIn PDF document text
    • http://rinejifivazori.epizy.com/embroidery_designs_dst_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 5456 bytes
SHA-256: eb105ad9b0a29870adf8bbc06cc71b00d5aab60f5f14d197f5b4c48a9c9c8058
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 9628 bytes
SHA-256: 97fb51923d444069b4246808eaa398bf175930cdf9be0312b0029a8965055f0c

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