Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d12a42ac1ffdd1…

MALICIOUS

PDF

81.5 KB Created: 2021-03-24 06:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0b3ad6079a68e5aa581a1c5f6429ba50 SHA-1: 3dfa69e094c4b3740990fcf12614b3a116283d1e SHA-256: a5d12a42ac1ffdd19250556dba65f9f1da6d059fbbaa797e60a24f7df9cc463e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to look like a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=walmart+near+me+open+time In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5fef67f88f13d.pdfIn PDF document text
    • http://teachost.com/xawapoxutuxewijirofegifizo63kz.pdfIn PDF document text
    • http://gooddevice-online.com/220352000784aqrw.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/18369779881.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/digahbE/.pdfIn PDF document text
    • http://sellamorem.com/probability_and_statistics_for_engineering_and_the_sciences_8th_edition_walpoleskn73.pdfIn PDF document text
    • http://vinorama.fun/pixel_pirates_apkcy4a3.pdfIn PDF document text
    • http://mmmuuuue.space/mopelurichrxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_60146db06223c.pdfIn PDF document text
    • http://sokinabunerir.iblogger.org/84512623176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fd85b8091a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_60548828c0f75.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/hjgc4CB/fusupidolemuse.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/aoac_official_methods_of_analysis_1990.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/7dhfFgj/the_maze_runner_series_movies_in_order.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ccf926c-13cf-4442-9daf-99aaf0ce44f1/tidopiladinoxojivozenato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6b67e9-692d-408b-8d8e-d65ff09c0fba/taylor_body_fat_scale_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d6a26e-f42a-4b21-b700-ab071cc6d690/93412288449.pdfIn PDF document text
    • http://juzelipa.rf.gd/pomirolatexevawikugabigoj.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/naming_organic_compounds_with_functional_groups_worksheet_with_answers.pdfIn PDF document text
    • http://zowedejiwut.epizy.com/lasuzizasuxaji.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_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 4800 bytes
SHA-256: 0c1a56a0d34d4f764d8f584ce3dfb5fd0a2cb8bd11705833e4eb35fedeaf3cdf
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 13916 bytes
SHA-256: 9bd553313f4bf2e6f1a15ff30e0b616bdd2db8c44b2148089159486b9966ead0

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