Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc51763555ab5a5…

MALICIOUS

PDF

83.0 KB Created: 2021-03-26 06:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3b2bb1b142f871d8832badf0ca706ed1 SHA-1: db33a88b15d2446e45557d943efa1a9a7aecfccc SHA-256: 8dc51763555ab5a5f16ffc69f26bdd73166c64f5ef20d8995d231a8e601f4d50
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious 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://botokaw.ru/123?utm_term=city+mini+baby+jogger+double+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386618/normal_603195694f044.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_605a048d12ed0.pdfIn PDF document text
    • http://ilook.market/gipemabxhcj9.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/how_a_bill_becomes_a_law_philippines.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/belly_fat_burning_exercises.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/47788840583.pdfIn PDF document text
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/9de2264.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/28870465654.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/6563593920.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/multiple_meaning_words_worksheets_4th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_600da19a8937d.pdfIn PDF document text
    • http://shoppermarket.online/43029429489dxzjp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_603462eff108c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_605a6654eb642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_603c4ff733b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_60467a06276b5.pdfIn PDF document text
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/e293694a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 8

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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5192 bytes
SHA-256: 9e7fe941dbe5410dc910bcb2bd46e3adddadaf3082f930ba8c7471735407a61e
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 6816 bytes
SHA-256: 5884341d851957c291679abfb2438fa62bd48e7ded3f737bea59d78405c862d0
font_02_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 11296 bytes
SHA-256: 08c25dfb7e0c2057f6a4b529eba5f93b2877d01dd00d0f41219e77cf6baa3fec

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