Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4af8e2218b2397e…

MALICIOUS

PDF

79.5 KB Created: 2021-04-30 05:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 796812e0e2d8af3026fc89f2edb78fc6 SHA-1: b4457feb92286fc96dc61fd6706b883257bb839e SHA-256: c4af8e2218b2397e11176b52e78ff3f7069c1689a716ec57477605a877b0a655
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=viewsonic+pjd5155+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474750/normal_604cb904efe2a.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/20743440388.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/cours_pour_apprendre_l_anglais.pdfIn PDF document text
    • http://yoga-fitness.space/57371117430gmur0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_6017aedadb92f.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/batwoman_comic_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427267/normal_5ff8294c6a199.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/formato_de_control_de_inventarios_en_excel_descargar.pdfIn PDF document text
    • http://reduslimitaly-official.website/toca_life_neighbourhood_secretsxggfq.pdfIn PDF document text
    • http://meetsalle.xyz/15331620816hidef.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/android_file_transfer_not_working_windowsilf89.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/mary_poppins_cast_2019_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_603ca98cbc132.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/a_survey_of_modern_algebra_birkhoff.pdfIn PDF document text
    • http://sugalomiwuto.getenjoyment.net/rukajibafiwifunusa.pdfIn PDF document text
    • http://veletekuti.66ghz.com/lepabaj.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/zudovajej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_605c9862ceec3.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/majewutujusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_604e9c5375ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474727/normal_6001a91001fe9.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/73253531511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380543/normal_600840c49c9e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabuzore.atwebpages.com/million_dollar_consulting_hall_of_fame.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_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 5528 bytes
SHA-256: f2f1ec3a433c213f66b2f4ab8564bc8dfaf3d13b352903c2ed73dd363d85ddae
font_01_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 10984 bytes
SHA-256: c877666b6366c82942fb0196ba86e511f249cc3a8fada54617319bb7e47b46cf