Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b7d23d5270da88…

MALICIOUS

PDF

80.8 KB Created: 2021-03-26 04:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 88b58f6cb2ce9fcc867f117a7d727fe1 SHA-1: 5cee1020b29b887e55523d4012d1818d10d9daa6 SHA-256: b4b7d23d5270da8824500ea371ed9a8dbe045190fe92718980464deaa87d690a
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 targeting search terms related to free PDF downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the presence of malicious redirector links suggests an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=sql+server+2008+r2+black+book+pdf+free+download In PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/67b530f.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/tesis_de_administracion_turistica_y_hotelera.pdfIn PDF document text
    • http://gladkoe-telo.xyz/what_is_the_due_date_for_1096sihjj.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/6233275.pdfIn PDF document text
    • http://azakalaza5.xyz/lagatueaf1l.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/hayward_pool_heater_service_code_lo.pdfIn PDF document text
    • http://azorocheat5.xyz/oral_b_pro_1000_replacement_heads4kue8.pdfIn PDF document text
    • http://kyukty68.xyz/38406712632ayt87.pdfIn PDF document text
    • https://xitosuwoga.weebly.com/uploads/1/3/3/9/133988858/kidagavawagarobewexe.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/searching_and_sorting_algorithm.pdfIn PDF document text
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/jupukuvisufaf-mudovumikobimel.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/43916261395.pdfIn PDF document text
    • http://usacreditreport.info/difference_between_simple_cycle_combined_cycle_gas_turbinenkyps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sibovup.epizy.com/98562000494.pdfIn PDF document text
    • http://piwenetawomot.rf.gd/libro_balun_canan_rosario_castellanos.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/anointing_fall_on_me_chords.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/dd_5th_edition_magic_items_list.pdfIn PDF document text
    • http://nidemavaguwagev.rf.gd/sasepij.pdfIn PDF document text
    • http://wobirazegezuw.epizy.com/amrinder_gill_movie_lahoriye.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/samsung_dishwasher_model_dmt400rhs_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/mevefojemenub.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/torchlight_2_engineer_summoner_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/kerazizorimo.pdfIn PDF document text
    • http://vutuzirowu.rf.gd/barycentre_exercices_corrigs.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/arabic_calendar_1440_with_english.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/comment_assembler_2_en_1_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/fepurebudijiziji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 5864 bytes
SHA-256: b91eb5ef81eacaf966f83ce13e313276e746b784ecbe5f564991a707440a1862
font_01_sfnt_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 10776 bytes
SHA-256: 888c15be627ea7e87b4d552c3580df7cf62c22ac2a1d9f96cba3d93854403fac
font_02_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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