Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a20141493de059…

MALICIOUS

PDF

77.4 KB Created: 2021-03-27 09:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ffc48d9187fbe5e5c25101315a121231 SHA-1: 49ee9a321d13a304e12ee25cfb8894dc3b20e080 SHA-256: 85a20141493de059f5491d7451abd5c436e00888498ff2a896d0d33f88b2a942
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jumiwimov.ru/award?keyword=cervical+cancer+cells+pdf PDF link annotation
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/lujajasit.pdfIn PDF document text
    • http://bivozebavi.iblogger.org/portador_de_anemia_falciforme_tratamiento.pdfIn PDF document text
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/047f560d7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/Cjfhjid/witcher_3_crafting_swords_white_orchard.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/Wajjfvt/how_to_write_a_proposal_letter_for_funding.pdfIn PDF document text
    • http://xopaberowiwin.getenjoyment.net/jodunodezapa.pdfIn PDF document text
    • https://cdn.sqhk.co/gikasiful/J4Fjhhf/zeganirapavo.pdfIn PDF document text
    • https://narusipanunajix.weebly.com/uploads/1/3/1/0/131069819/6896137.pdfIn PDF document text
    • https://cdn.sqhk.co/vinizedanuve/hhh6zhb/coal_mining_incident_in_south_wales.pdfIn PDF document text
    • http://wazasutosas.iblogger.org/37635876203.pdfIn PDF document text
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/kafopevopereguga.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/futul.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/whale_done_stampin_up_cards.pdfIn PDF document text
    • https://fadefufogu.weebly.com/uploads/1/3/5/9/135960472/wunofuvibepa.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/nR3havI/jupegizepav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasemejatafa.rf.gd/acrobat_reader_10_free_italiano.pdfIn PDF document text
    • http://nokebubikirog.rf.gd/cours_de_francais_grammaire_en_ligne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1a2d75-ad83-4c5a-a299-2b9ba8652297/84868217959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3318924-6ed1-4f06-a610-e1834268aa10/61006748007.pdfIn PDF document text
    • http://roxanotox.epizy.com/types_of_pneumatic_control_valves.pdfIn PDF document text
    • http://vavarogusofu.epizy.com/sokigas.pdfIn PDF document text
    • http://livugaxoretedop.epizy.com/what_does_say_mean_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c408bf06-dfc2-4bf0-b7ec-de873dfa9038/how_great_thou_art_lyrics_methodist_hymnal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559c98fe-56cf-40a5-95d4-23383817fe2a/ethical_hacking_training_free_online.pdfIn PDF document text
    • http://fogevodazeta.epizy.com/vuseleluzekem.pdfIn PDF document text
    • http://tikavufuku.rf.gd/52483954587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f6d8ea-3972-4f0e-9f4d-318690345782/mr_lee_water_cycle_rap_lyrics.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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5116 bytes
SHA-256: 37d1a0a0130352fecbe57e9240d4af3f510703348722f4d6a981ec1b98ddc326
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 11104 bytes
SHA-256: 8689bfa1365ab98cb134111af420222df6748f63511ea40e0808722583925af6