Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0db76c17f507bb…

MALICIOUS

PDF

77.6 KB Created: 2021-02-10 19:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 3e53d0d83ec4f048e60cc6c22c551a57 SHA-1: b6095efad0da46c7526d191344b6e605b390719a SHA-256: 4b0db76c17f507bba01ed02b2ca25183d47091c99f1e02444057870797c720f2
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into providing a password for an archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/aws?utm_term=bhajan++free+ringtone PDF link annotation
    • https://gikapatom.weebly.com/uploads/1/3/4/0/134042778/31efe06893d5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444852/normal_5ffe4d43efa9f.pdfIn PDF document text
    • http://molotkov.site/39912162807lbgia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380403/normal_5ffc56fc730d4.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/3bd4ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fd8074ba8bd5.pdfIn PDF document text
    • http://hookup153.space/current_klamath_river_fishing_reportywqn0.pdfIn PDF document text
    • http://ens-pictures.ru/excel_countif_multiple_criteria_different_sheetamea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_601f3988a61e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_600fd7d793393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6018d01b391ff.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/ranubumu_fumalilupojup_linowenep_wozuvosino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5ff1d2f4dee4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6019048747fa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463830/normal_600276e18003f.pdfIn PDF document text
    • http://ca-manalapan.space/garrett_hardin_lifeboat_ethics_summarylwf8w.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/zoneserakotutupebute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesufonezis.epizy.com/94452901958.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_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 4944 bytes
SHA-256: bc3bf617e4e65cc8d6c3c2eceb83de4d9eb97563062afa4fccebe09b863c4414
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10324 bytes
SHA-256: 9a799e8b1cbb51bf07eb7511cb3f1325b5eb7c7f2f3d05fe08a8b486c5d2c3e5

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