Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ea68ad6e5eb3fc…

MALICIOUS

PDF

82.1 KB Created: 2021-04-05 14:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c7e5ffab266227f40c55301c3f974e18 SHA-1: 2591fe245d4e3ef0945c8bbe268a61fb341c373c SHA-256: 81ea68ad6e5eb3fc73feee42a0a05d9e5231486fc50d00c88b87ebf7d44c8b2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/aws?utm_term=competency+based+interview+questions+and+answers+for+hr+administrator PDF link annotation
    • http://teksalle.xyz/73830485758wqosr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5ff2907845e94.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/gjVWCja/96607567656.pdfIn PDF document text
    • http://qrettalq.online/wagner_steamer_7059i00o.pdfIn PDF document text
    • http://baranaydin.org/how_to_clean_dash_egg_cookeroafur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490738/normal_6028632ab72b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_604f061d4d589.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421623/normal_6007275f04ef1.pdfIn PDF document text
    • http://ludshop.xyz/korotevivugejorimejanepobh3rz1.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/jjyibjg/80462540595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5fd852498b2fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fcca211871ee.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/d2uhbif/94521178238.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/f1wVgQb/nudagizuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://donovebar.rf.gd/wuwozogusixuxufodabox.pdfIn PDF document text
    • http://monufurojebuwod.rf.gd/cursive_alphabet_writing.pdfIn PDF document text
    • http://gejaran.epizy.com/juvujimudikagefap.pdfIn PDF document text
    • http://todosix.epizy.com/6176976390.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 5788 bytes
SHA-256: 12591749f50fdbc4dc93c26942171323559eac2b324b51a0b704ff4682b2da39
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 10476 bytes
SHA-256: 1ea5ad113d9d3de72fe55bad9c9edc329a81548a7676156fe1524d2b2b761fc1
font_02_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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