Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f72f79c9c36f75…

MALICIOUS

PDF

67.4 KB Created: 2021-02-27 10:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f6512ec8aa0e951ac1234e72695fa20a SHA-1: 7c25b4b30316e09e3385865b9ce520bcafba9479 SHA-256: f4f72f79c9c36f75dffdd4d813abf739d6347cafde5e2f22e46780ca248b36a3
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jumiwimov.ru/aws?utm_term=panasonic+answering+machine+customer+service PDF link annotation
    • http://899themes-demo.ru/73421350147yd5vw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5fe4c23a4aded.pdfIn PDF document text
    • http://foluxokifoni.22web.org/53797249921.pdfIn PDF document text
    • http://finansi-7.online/how_to_clean_filter_on_frigidaire_dehumidifier_fad704dwdnt1st.pdfIn PDF document text
    • http://bbcua.site/3650340599235pfj.pdfIn PDF document text
    • http://dostafood.xyz/accident_report_bbc_newsyshnq.pdfIn PDF document text
    • http://diwokaxojizo.iblogger.org/dubowibet.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/julaxel/carcassi_etudes.pdfIn PDF document text
    • http://lixutepojux.rf.gd/junagan.pdfIn PDF document text
    • http://setopuvoxuz.epizy.com/manitoulin_island_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/beautiful_flowers_background_images_free.pdfIn PDF document text
    • http://xekubot.epizy.com/wureletenen.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_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 5332 bytes
SHA-256: cc9b2ef956ab2604dc63d81e96881edb75c3fcede2ef556b85de48f81998ba3f
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10016 bytes
SHA-256: f8dbc567b57e61df8bc9de94156d0b49a08c325af93bf90a0c76e2b609e2a871

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