Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b10b82770e16db…

MALICIOUS

PDF

79.2 KB Created: 2021-03-11 19:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 77931a26c6ae6f346ea66ac5effd1a95 SHA-1: 0a07e608e59f973426c5bd25e72abdd8247f80c4 SHA-256: c5b10b82770e16db42461dbdd78225039ee160a92e72d5d39e3f858b8fb9616e
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and a fake invoice lure. The embedded URLs, such as 'https://zajinet.ru/award?keyword=que+es+un+diagnostico+psicosocial+pdf', suggest a phishing attempt to trick users into visiting a malicious site. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=que+es+un+diagnostico+psicosocial+pdf PDF link annotation
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/foweramelegitulun.pdfIn PDF document text
    • http://insurancesouk.com/77090796289nz0z1.pdfIn PDF document text
    • http://kipukosolenures.22web.org/detixopewotunip.pdfIn PDF document text
    • http://tusukezilineji.66ghz.com/perfect_progressive_tense_exercises.pdfIn PDF document text
    • https://leluwimatuw.weebly.com/uploads/1/3/0/9/130969986/290144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_603d3ecba5e7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_601dab4154b1d.pdfIn PDF document text
    • http://shop-profildoors.ru/monster_2003_watch_onlinewewnm.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/gekupub_nepax_bozojegeviwe_vepuguleme.pdfIn PDF document text
    • http://technodom11.com/27921224762qnixl.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/6c50d8d999e85.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/TEjbyhc/car_mechanic_simulator_ps4_xp_cheat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_600f51925dbc9.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/jfpgijc/3783224805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_602787d787121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459788/normal_603e6b1b25c57.pdfIn PDF document text
    • http://creditstar-kabinet.com/27417080218gnf7q.pdfIn PDF document text
    • http://copalofa.site/rivals_esports_moba_manager_cheatstnhxr.pdfIn PDF document text
    • http://nidupokezol.iblogger.org/how_to_do_fabric_painting_step_by_step.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb94a35-428f-4e09-90a1-1c7306c9edee/kewemevezurifalakidad.pdfIn PDF document text
    • http://wovutemikinodow.rf.gd/medical_microbiology_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62242f1-a328-43e4-9fde-4ad7fab5a814/tisitipuwugovosijomotupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993b3a73-b0d6-4731-be76-c9ec5554f0bf/how_do_you_calculate_monthly_interest_on_a_past_due_invoice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c753f099-b60b-4d7a-bfc5-205e35d38e2f/pinona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3cbdd3-185a-4eaa-b589-b25447edbc0b/nitro_cloud_jpg_to_word_converter.pdfIn PDF document text
    • http://wozawexopad.epizy.com/jopuwafodegusuduripo.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_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 5288 bytes
SHA-256: 300ada0bebca231e906f369fd23a33e56761548d8fa51e5a3e69939e5534f020
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 11376 bytes
SHA-256: 37fb00a9319b8c8f3721f1e51ca8839434918c1f7ab80fcafb374a794240defd