Malicious PDF — malware analysis report

Static analysis result for SHA-256 1835fb553a0b26ff…

MALICIOUS

PDF

85.0 KB Created: 2021-03-01 09:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8b7e3d92e58d380ce36a22c27c7d170d SHA-1: a6f6f42a15c79a658e59b443c5b2786aea5f8a7d SHA-256: 1835fb553a0b26ff00e3960103fb7b09a09eedd55ae7c070a4c2e9b537d319c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to potentially malicious or phishing sites.

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.
  • 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://golowaki.ru/strik?utm_term=plantronics+backbeat+fit+2100+pairing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fd3a61a84b99.pdfIn PDF document text
    • https://vufemare.weebly.com/uploads/1/3/4/8/134855896/1ba4ce24444cef.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/om_shanti_oshana_with_english_subtityssug.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/doruzigamuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6014e3834d318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_601a6d9ce9415.pdfIn PDF document text
    • http://tlgfree.xyz/aromatherapy_essential_oil_recipes01729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_6001b07c7cb6b.pdfIn PDF document text
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/nakikozetokexe_fufigobij_pavubofaxu_kisiner.pdfIn PDF document text
    • http://glossywp.online/gta_5_online_haircutsqz6ek.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/how_to_train_for_soccer_fitness.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5fe9947cef6b5.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/xugubo-filiseleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_602cef34b5f06.pdfIn PDF document text
    • http://merovew.xyz/fizovugajewamaxujateluse0goj6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_6035796f66977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c6a1b411d5.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/bisapovepizaj/21864198610.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_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 5712 bytes
SHA-256: 26d9419d27cfe12ef3ea121c518a5de523054c32f576ec15f9dac8618e162021
font_01_sfnt_off00012279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12279 10620 bytes
SHA-256: 9a2a54af58ec9034f9b5c8b633208509e8fd61bf2da1faa88d5c05497a09c8ca

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