Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf807982c99f639…

MALICIOUS

PDF

93.3 KB Created: 2021-03-27 22:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dc18e638983a57c56c2e3da3cd821a8 SHA-1: e84159e9d07d87f58c782ad82c1ff177ab90a4a2 SHA-256: ecf807982c99f639784435120497cefcc77d40f5e08760be9b3a4f5cfba38a4b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other file-hosting services, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=cosmos+carl+sagan+pdf+romana
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/4989590.pdf
    • https://jividakole.weebly.com/uploads/1/3/6/0/136090299/414407.pdf
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/86835252ecaf06.pdf
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/5387499.pdf
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/1621617.pdf
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/sidazu_xodowagaloka_gamomofomopuw_dodalokonepik.pdf
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/8168719.pdf
    • https://tiselewo.weebly.com/uploads/1/3/1/6/131606631/gezewifagi_belaxabolol_xenukazigitoxof_bewamapumid.pdf
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/1f0e9894cdb780.pdf
    • https://bisadujepuza.weebly.com/uploads/1/3/4/4/134444209/1e82d9086.pdf
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/gasewimetewunafonapo.pdf
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/b6da50283b1b403.pdf
    • https://xajimamu.weebly.com/uploads/1/3/5/3/135314586/jusus_fanomuvota_detozako_damufafuzi.pdf
    • https://berovifis.weebly.com/uploads/1/3/4/7/134730871/11fcf1.pdf
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/2487425.pdf
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/dezilatibimewudo.pdf
    • https://basafokadu.weebly.com/uploads/1/3/4/7/134706648/2f3050.pdf
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/kupuzof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_b0cf56dfa9e7463ea4b27e3f598de054.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e9ad8ac1-b8a8-4ee0-b750-a9cd7069cfbd/present_continuous_exercises_online_primary.pdf
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_6df3270f5ab54c5394d474c418ae79be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5eae25a2-267b-4e35-9266-a5b2dd0685a8/bosch_dishwasher_installer_near_me.pdf
    • https://uploads.strikinglycdn.com/files/7fb6c260-31a9-49d3-a025-290137ac0593/17816413748.pdf
    • https://uploads.strikinglycdn.com/files/56a4f26d-bdc1-4f7b-b1c4-2efcc0be6e18/lirisojo.pdf
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_addd0bb6e945464eb019bf01fe310967.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4f6df84d-91bd-44d9-ab6c-4db67b10a34d/gewerogotakazuxan.pdf
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_bf461854796243ec8c7b65b184614718.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012051.bin
6d03c5f395fb0d8c7ea3ffaaf276f3809c02c0b3352f2e14533aabe47c61f7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 5040 bytes
font_01_sfnt_off0001314b.bin
976950a273526f043932d9f591507e603d9da06279e5e04e38d4af020fc67feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 12072 bytes
font_02_sfnt_off000159a1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159A1 4324 bytes

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