Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe342616d1bd8fd…

MALICIOUS

PDF

83.7 KB Created: 2021-03-15 08:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3bb9bbb8fe57be52d0e266b0f66c03a2 SHA-1: 9b9979fe2dafa280d2c7fc08dd82925256d13ac7 SHA-256: cbe342616d1bd8fd6d69fd83be0b1e7deee8164040799614075cff166eeef974
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 0.9998

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://golowaki.ru/strik?utm_term=how+to+train+chest+with+bodyweight PDF link annotation
    • https://cdn.sqhk.co/naruxibe/jhii8Ci/58750517154.pdfIn PDF document text
    • https://namekabesomi.weebly.com/uploads/1/3/4/6/134668803/8884451.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/nipisol.pdfIn PDF document text
    • http://vnds-v.website/65437453386kbjt9.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/close_encounters_communication_in_relationships_4th_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/taranumota/H8EhjSP/emergency_alarm_sound_wav_free_download.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/6th_pay_commission_karnataka_kannada.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/leaf_by_niggle_audio.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/sisimagupol_fumop_zafasazopudi_dedixum.pdfIn PDF document text
    • http://zhigina.ru/autisme_montreal_formationyd7by.pdfIn PDF document text
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/4763321d5bbd8af.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/stepanoff_a._j_1957_centrifugal_and_axial_flow_pumps.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/pokemon_y_walkthrough_serebii.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/kemefotizo.pdfIn PDF document text
    • http://avto-document.site/bhagavad_gita_online_hindi5z6nx.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/Bhe7jih/xagelunotubefuforusovana.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/ba954f4166ab00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugazukadum.onlinewebshop.net/wowimotimave.pdfIn PDF document text
    • http://nununad.myartsonline.com/engineering_change_management_process.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/nonajuj.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_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 5464 bytes
SHA-256: 65f9e32197d370996de425ada2f3fc7c4149797161e3d4c6fb062268a2162bf3
font_01_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10884 bytes
SHA-256: 6ef32330eb2caeb01b84bdfb2d556f8d99d0ba1b51731b4816456cc80b362e2a

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