Malicious PDF — malware analysis report

Static analysis result for SHA-256 be42a7904ebd1664…

MALICIOUS

PDF

66.5 KB Created: 2021-02-18 21:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9842fedc27b8d9fa9f375058ff2bf0d3 SHA-1: f9d78eaeabf802638cab7135e85b3fe0fbb24971 SHA-256: be42a7904ebd1664ceb56d449811c3705df76f0998fcf3db1927f341b02f91b0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for redirector links to known malicious infrastructure. The embedded URLs and the PDF structure indicate a link farm designed to direct users to potentially harmful content. The ML classifier output of 0.999732 further supports the malicious classification.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=fortran+tutorialspoint+pdf In PDF document text
    • http://prizinsta365.website/ruxibefipitejiwopusibomemn150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_60261bfd91458.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/lulekifiritoxubivi2vl9l.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/IhdKLQZ/rajugat.pdfIn PDF document text
    • http://dostafood.xyz/57754204025qkb0t.pdfIn PDF document text
    • http://investmag.org/rufometokbsov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464715/normal_60016a01b4aac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417305/normal_5ff846efb847c.pdfIn PDF document text
    • http://copyright-notice-ig.com/bharatanatyam_jathiswaram_song_freelmh2n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493549/normal_5ff33d1c5c14e.pdfIn PDF document text
    • http://kino-vezde.ru/lumewuvul3pe92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_601d2f2546d1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70F 4988 bytes
SHA-256: a5e24a8987fcf06c560018ebea7f347be94d58b54988a868f37707da0d290545
font_01_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 11016 bytes
SHA-256: a380ef798daa0da8fb2b74ff543ff4d0107c69e3cb29f1a6df4ce56a7f53a4bd

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