Malicious PDF — malware analysis report

Static analysis result for SHA-256 d708c5d38dd5168f…

MALICIOUS

PDF

70.5 KB Created: 2021-03-26 07:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 26567544153470c8486c616efc957de0 SHA-1: a3e10759d7cf5d0cf4315b3420dabf574848d2f6 SHA-256: d708c5d38dd5168f5af051bb27b4c2d66aec8a71be12415c09ce6fff7ec7e1d4
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=ampicillin+sodium+davis+pdf PDF link annotation
    • http://ttttrrrr.space/sniper_assassin_2_unblocked_gamesrhare.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/tratamiento_quirurgico_de_cancer_de_tiroides.pdfIn PDF document text
    • http://fiwamixos.iblogger.org/atheist_bible.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_60048584c4c3c.pdfIn PDF document text
    • http://bunokegezodidur.iblogger.org/english_conversation_lessons_for_adults.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_5fe1c07cc8a13.pdfIn PDF document text
    • http://xadejidigakezu.iblogger.org/63794625749.pdfIn PDF document text
    • http://seamanygau.best/rijidexowiwaledavuvuglp8yp.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/atualizar_android_samsungmstn8.pdfIn PDF document text
    • http://1fps.ru/why_does_my_netgear_router_not_workdo1z5.pdfIn PDF document text
    • http://about-central.com/fixopalefefurewovevmcub6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_5feaed9b6fa29.pdfIn PDF document text
    • http://mritzoliver.design/friendly_letter_parts1odz3.pdfIn PDF document text
    • http://pubifirona.22web.org/pafonemerodetanezinowe.pdfIn PDF document text
    • http://opensoda.pro/rijilakowasugu70tk0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_69e802d6d0cd4f92ba8db00e111987ab.pdf?index=trueIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_c2a3f6a083a549c3aad81cdb04f6e424.pdf?index=trueIn PDF document text
    • http://vopawolug.epizy.com/ronudomemuzizoloxokib.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_a714be098cb54949a8665e0938dd6954.pdf?index=trueIn PDF document text
    • http://pukafenofi.epizy.com/late_for_work_warning_letter_template.pdfIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_1dfa5b4053d247618926a2cabf6068a0.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_a1c39ee1c8504c418bb49123f010625e.pdf?index=trueIn 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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 5252 bytes
SHA-256: 9bd2be8e253ade7ce04adec3d882288f4a3271d6654f33c6506c22e4d2a6fa50
font_01_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 10860 bytes
SHA-256: 2d410ae799d6e6440a48fe01b4a9f6af89c004b88005dbf8af449ac16cdb10d0

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