Malicious PDF — malware analysis report

Static analysis result for SHA-256 61dde02d5f7cbff4…

MALICIOUS

PDF

80.8 KB Created: 2021-06-01 07:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d616ee8fe7605707fb23636e3effe253 SHA-1: d2652f900b7c28963ac7aa9ff783736472e4d152 SHA-256: 61dde02d5f7cbff45f80fc4ddaa58c33675e1b239db84a372232982ed81c9f25
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

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 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://garglob.ru/pbw?utm_term=present+continuous+complete+the+sentences+with+the+correct+form+of+the+verb+in+parentheses PDF link annotation
    • https://desivisigoxup.weebly.com/uploads/1/3/4/6/134681557/6215530.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410965/normal_60afe8bae69db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_60570a1f548a1.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/bisuxejonenoxu-timegukoso-givelibanozunal-xobapivi.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/xevox.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/38456f78cd9d.pdfIn PDF document text
    • https://rakidovarej.weebly.com/uploads/1/3/4/6/134685608/ponasolufob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_602c5a1560ec6.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4494166/normal_60b591c6c26b6.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/sufigalijibupen_goxod_suxunun_guluxifobimoke.pdfIn PDF document text
    • https://dofidosuxemaxej.weebly.com/uploads/1/3/4/5/134595751/a163f0839142270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_601a99b68fb3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5ff8dc1e2895b.pdfIn PDF document text
    • https://xumodaniteged.weebly.com/uploads/1/3/4/4/134480563/c53a9844e81e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_601163b3e052b.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/9409764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_606944c11ebf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144442197/jofijepotikoxagufeseripe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c194604-46ff-48aa-9f05-1637e283668c/fudufipikokososuzab.pdfIn PDF document text
    • http://lokiboz.pbworks.com/f/historia_de_amor_piano.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144441264/59567474212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa41a45b-ec12-4715-98c9-d0a9e8b850da/70444627709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ffbd38-32e0-41a0-95fe-2cad7a7064f1/harman_p61a_pellet_stove_reviews.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144427197/5359460800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915f41a3-152a-4469-a1dd-105a11005c20/90s_quiz_game_answers_level_96.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4578944f-8f71-43f3-92a7-eee9d3695f4b/70961454092.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_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5548 bytes
SHA-256: 2a9bf064a6bdeb9d350e382e3d0dce29e3c67912087a1b22b444da92d1ccb006
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 15304 bytes
SHA-256: 932b7f952cfce0f617ead2e2687d4886c6f4d32a1df3b8432fc2298b467b8c13

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