Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7a00dcf1f443bc…

MALICIOUS

PDF

75.3 KB Created: 2021-04-11 16:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c1c6e85215d5d4475c7cb6df9e66dc28 SHA-1: c82e16754e0f2753d00592047074e648c7f5fccf SHA-256: 9f7a00dcf1f443bc6b2c6d04873e00d144b62f60cd5923a35322f2723f7db2f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating it is part of a link farm, likely for SEO manipulation or to obscure malicious redirects. The primary URL 'https://zajinet.ru/strik?utm_term=ps3+remote+control+pairing' suggests a lure related to PS3 remote control pairing. While no scripts were directly extracted, the PDF structure and numerous external links, including one to a potentially malicious domain, strongly suggest a phishing or redirection attack. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=ps3+remote+control+pairing PDF link annotation
    • http://figedizizexi.22web.org/strength_anatomy_workout.pdfIn PDF document text
    • http://myluckybet.xyz/formato_certificado_medico_prenupcia5nbu6.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/what_does_the_firmament_of_heaven_meaniq6kk.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/aldehidos_cetonas_y_acidos_carboxilicos.pdfIn PDF document text
    • http://gewututikame.getenjoyment.net/liberalism_find_a_cure.pdfIn PDF document text
    • http://autocredit.moscow/skyrim_dragon_language_alphabet_translationtijvv.pdfIn PDF document text
    • http://dopenukivo.22web.org/96960045492.pdfIn PDF document text
    • http://espacecmb.xyz/obra_el_principe_de_nicolas_maquiavelo_resumen5b621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_ade379656cfe47dda449ab741bc3022d.pdf?index=trueIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_03c3b800b8044d039c512c66a1cfce4a.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_06a4884aad414a738c52ac127683d075.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/674f21ac-0288-4d65-8821-ae4c867c7396/romeo_and_juliet_quiz_act_1.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_2db803d74d8e4140abaf34ab3748b595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f50c4a-da06-4b3b-a189-1aa31d215caa/gejabefako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1adce49-a842-4cb8-94d1-7ac91e6a457a/list_of_danielle_steel_books.pdfIn PDF document text
    • http://resimibesogew.rf.gd/bubaxogakavinaka.pdfIn PDF document text
    • http://febiked.rf.gd/turexijug.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_b877a0a931004d63823e26323345e2f5.pdf?index=trueIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_ec22326da1f5440e811fda4a6a6029ec.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_856ab1915c734622aedc70648b89c7cf.pdf?index=trueIn PDF document text
    • http://zotubune.myartsonline.com/52212918333.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_50b6d1e2781a4bb687c9f0a7ffa0013e.pdf?index=trueIn PDF document text
    • http://tefetuzuzip.myartsonline.com/vamivozonivurafopewamu.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_4f98ebe6d9014f289b0ad6c58ea5353a.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_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 5416 bytes
SHA-256: 9ce82d20b7cafc56a75204d755a067ddd6fac2f02a3f18af63f06d5fe5d8185d
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10408 bytes
SHA-256: 84f77e71756c518a2a19299a0e535c979164e979476866ee293b58df25edd22d

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