Malicious PDF — malware analysis report

Static analysis result for SHA-256 400afb878fba900f…

MALICIOUS

PDF

82.2 KB Created: 2021-03-14 09:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 181e2d129acce3c5c0effc6cb2d99643 SHA-1: e9f7859b486a8c3ce873c1a46354adfdea367498 SHA-256: 400afb878fba900f08a28f0b79576c37acfe767d2944d0e75ac2159e33740120
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents but lead to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The embedded URL 'https://baarspo.ru/wix?keyword=minecraft+0.13.0.15+apk' suggests a lure for downloading an Android application, likely a scam or phishing attempt. No scripts were extracted, but the PDF structure itself is used to host a link farm.

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 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.
  • 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://baarspo.ru/wix?keyword=minecraft+0.13.0.15+apk PDF link annotation
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/golerapo.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/hqjd2Sf/wrestling_revolution_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/fGggdge/mepizake.pdfIn PDF document text
    • https://disipewadapa.weebly.com/uploads/1/3/4/8/134870645/4137812.pdfIn PDF document text
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/ruduro-fupagove.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/pejawan.pdfIn PDF document text
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/zuvijimijatinageviv.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/learning_to_read_malcolm_x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepatodop.onlinewebshop.net/curso_gratuito_primeros_auxilios_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/bogemedi.pdfIn PDF document text
    • http://poborunedajemo.onlinewebshop.net/80731802542.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/besigow.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/libajafiruwegejobosipodav.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_247c6077340a4df0a457a2819beab57e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/lelubo.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/atomistique_liaison_chimique.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_d430910be0de48e3aee3ff150d71f5ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/43739397744.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_07a9d0dcb99f426a81f339c311f1aa22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/calculus_problems_and_answers_test.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_0fc23907baac46c7bf5e6f3090cdbb00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/coenzyme_q10_benefits.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_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 5380 bytes
SHA-256: 18fdc6c97060308adafee40d2c95be94f4c00f3ffb60b72d68818e959c3e2a29
font_01_sfnt_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 11024 bytes
SHA-256: 4406c23e55c8d9e4c2721d132c22f581f731746d0ce28e01c195d7b69f2f40be

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