Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ba25273429dbb…

MALICIOUS

PDF

71.5 KB Created: 2021-02-21 05:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 28ef972d30e371a86f928730511bdb8d SHA-1: 33924c0f60d3661e635421c0a927c61eecf82b87 SHA-256: 5d4ba25273429dbb321c9162583fe0578c827d9074ff29b4d695bed2f34825ff
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 file contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple Weebly and other disposable hosting links points towards a campaign designed to obscure the ultimate destination or host malicious content.

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://maypoin.ru/123?utm_term=where+can+i+watch+the+time+traveler%2527s+wife PDF link annotation
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/3836076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_602fcee8431fa.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/at6gcgh/stack_ball_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/gfRgIFH/100_doors_horror_level_16.pdfIn PDF document text
    • https://wujatukeki.weebly.com/uploads/1/3/1/8/131856991/divexobaluwoxup.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/vozoser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421207/normal_6008dd2651169.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/hhHVjf3/5333789155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465018/normal_5fe555113753e.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/7175598.pdfIn PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/pipizobowelub-bamasofofovod-deporejuj.pdfIn PDF document text
    • http://konujojijitezu.iblogger.org/network_security_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepesori.rf.gd/admission_form_format.pdfIn PDF document text
    • http://kuvujibirili.epizy.com/vadigej.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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 5320 bytes
SHA-256: 80ce8e85c35a02d1fc52f23c216c3d314b118b739c5471f41923d88717363a30
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 10308 bytes
SHA-256: 0fa7767d1ec2019b33a0bed4b68435d1ca422963aabd5b86ff34f9f6bf01e939

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