Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d531a8daa65cbc…

MALICIOUS

PDF

95.1 KB Created: 2021-03-03 01:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: b12091823e3b0aebc55734561c105f97 SHA-1: 0f639a5a20b34f99b68641ff1ab1f907b191da36 SHA-256: b9d531a8daa65cbce0a0aeb3fad4ab56ff5cec31329e752b8a0b67a275cfe10c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, characteristic of phishing or malware distribution campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, further supporting the phishing lure attack pattern. No scripts were extracted, but the presence of numerous external URIs suggests the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=tl-wr841nd+openwrt+repeater PDF link annotation
    • https://cdn.sqhk.co/dajebala/Z1Igeea/cops_and_robbers_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/igIFKeM/55434018803.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/the_secret_life_of_plants_stevie_wonder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_6035cb12c663d.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/dyggjcs/19937723917.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/why_is_my_controller_flashing_white.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/how_do_you_program_an_rca_universal_remote_to_a_vizio_tv.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/6067269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60377a4cc80cc.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/dixeworunowolulitab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_6016fc51d8234.pdfIn PDF document text
    • http://fegalaro.iblogger.org/tipicidade_formal_cpp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jusarim.epizy.com/rebozagaririnodaxemofubaj.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_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 5184 bytes
SHA-256: fa4731dd02d2ef60899eee3a70ee7277e3c48a3c773c90574859ea975f8df016
font_01_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 16056 bytes
SHA-256: 1dd6489025f4e2a7457aa338141bcf06889d1bdd63caf9f0c3108d3090361652

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