Malicious PDF — malware analysis report

Static analysis result for SHA-256 6133202fff0f61ce…

MALICIOUS

PDF

76.8 KB Created: 2021-03-30 05:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 8d3ed0f2aa41b3640efdbad18147c336 SHA-1: cb5d52d54c53b10ccc7770ea42e8bb37bc10f5b8 SHA-256: 6133202fff0f61ce1224713d79376e1c676e2ab33d7ab3cd6619288620a1faeb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links to other PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, with the ML model outputting a high probability of maliciousness. The presence of numerous external links suggests an attempt to direct users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://lutonetofon.iblogger.org/hazardous_waste_management_journal.pdf In PDF document text
    • http://andyhongdigital.com/42365923180bsnvk.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/300_graphic_novel_free_download.pdfIn PDF document text
    • https://vufegolafo.weebly.com/uploads/1/3/0/9/130969987/9578858.pdfIn PDF document text
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/5626635.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/moog_sub_37.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/6845.pdfIn PDF document text
    • http://mestorating.ru/nemaxufiviwupuxami84jmu.pdfIn PDF document text
    • http://duxaromovaxizom.iblogger.org/pijamepumexowo.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/niwabakab-rabuzowomu.pdfIn PDF document text
    • http://xploitcrew.io/45674833945763kf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=justin%20guitar%20music%20theory%20coursePDF link annotation
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_b91abe8bb7c345a78af88b4e82249da1.pdf?index=trueIn PDF document text
    • http://novupomajanox.atwebpages.com/tareguwodawetuwobak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84aa2d1a-116a-4112-879e-2a4436de6da6/89030857004.pdfIn PDF document text
    • http://wazipegemezen.atwebpages.com/el_conde_lucanor_castellano_antiguo.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_968bfb53e00f48fa806e62a6cc089d28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8281a80d-2be7-41c6-8342-a472af6b3d98/html_css_link_page.pdfIn PDF document text
    • http://jidagizonan.epizy.com/78282302507.pdfIn PDF document text
    • http://nevejubusager.rf.gd/56461047245.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_6a711874200a4227ae4304eca77691a6.pdf?index=trueIn 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_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 5272 bytes
SHA-256: d9ed5169563c91f61edac90fde978f1713487bfbfbb399c9955c24fa6ed64321
font_01_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 11064 bytes
SHA-256: 4ea31086da401562754f53ecbdc257bbf8794baff78fc500a280bf8c6fda7b7b

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