Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8af300a210a7016…

MALICIOUS

PDF

82.8 KB Created: 2021-04-24 19:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a5d05b4ff8117c2664fa66d85ed74b13 SHA-1: a2e09792f1c169f3e9688aedbbeb1470ea3bac2e SHA-256: f8af300a210a7016d0a5ccf715a5623978385f072a97c4e80816d09f668c3d74
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the document's structure and embedded links suggest a phishing or redirection attempt, likely aiming to lead users to malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=why+did+the+us+get+involved+in+hawaii In PDF document text
    • http://fovejawurolugaf.iblogger.org/line_segment_addition_postulate_worksheet.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/bdad2c1e47e876c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5ff53bab240bc.pdfIn PDF document text
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/fezewelosenolutu.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/pemozetegetezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_5ff901442af74.pdfIn PDF document text
    • https://tinubabitem.weebly.com/uploads/1/3/4/3/134361694/wovoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_606750835b914.pdfIn PDF document text
    • http://byseles.xyz/vunivegefokalupewaguduvbbfxs.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/9566583.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/livro_capites_da_areia_download.pdfIn PDF document text
    • http://ogranicbio.fun/noxeku3yp38.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/23773735947.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/tan_calculus_early_transcendentals_solutions_manual.pdfIn PDF document text
    • http://xorudaz.iblogger.org/does_bushnell_binoculars_have_lifetime_warranty.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • http://riwejurefuwubep.iblogger.org/loruwimedumozesoson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_6007a51414965.pdfIn PDF document text
    • http://hayatevesigar.online/what_is_the_significance_of_transcendentalism_in_american_literature1l35l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakininutopojub.rf.gd/metric_allen_bolt_size_chart.pdfIn PDF document text
    • http://zobatokuvanoz.epizy.com/1220083169.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_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 5256 bytes
SHA-256: 3a796fea42bc5e9a48a83cc80fc14e2f91d1b6a125211ccda5b8c09d80526e49
font_01_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 11688 bytes
SHA-256: 949309f09ed07450872693f51eda69666a3846add12d2a6118129cf7ca0f9ee2

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