Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a143275a7c5d4a3…

MALICIOUS

PDF

62.4 KB Created: 2021-06-13 12:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4c64e93c7e421ca4aa51a0991e66eb8a SHA-1: 90a882558017bad81f2664054d31561ebebe9bdd SHA-256: 0a143275a7c5d4a374dec280e63cac7044bf8cf9f38afcf23144eaae033fbc37
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9494

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.
  • 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
  • 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://philabc.ru/pbw?utm_term=name+of+sun+god+in+greek+mythology PDF link annotation
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/gipomowojiku-sazer.pdfIn PDF document text
    • https://kulipimeg.weebly.com/uploads/1/3/2/6/132695915/1748073.pdfIn PDF document text
    • https://nipodixosun.weebly.com/uploads/1/3/4/4/134494364/gejufifibuxunej-zedazulop-dizuxe.pdfIn PDF document text
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/lupefa_rulamogewapubel_nukata_mopujo.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/9605950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6016006838f36.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/renatew_bixor_dozibuponisafo.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/lomagutobom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_60bf94cf7fb65.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/2927119.pdfIn PDF document text
    • https://sepolekabu.weebly.com/uploads/1/3/1/6/131606201/736f6c700a1d5d.pdfIn PDF document text
    • https://bozaxemavokasum.weebly.com/uploads/1/3/1/3/131383719/4361656.pdfIn PDF document text
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/1142910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_60c3aed4a45dd.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/64b51a40-3d24-4ddf-a939-ecd0e056f550/87400633907.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144417252/pujexifanewonemivorefefoz.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144453372/microsoft_word_2013_exercises_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d7c6d0-dd30-4672-9842-eb2836f80e08/que_beneficios_tiene_las_almendras_para_la_salud.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144473871/how_to_calculate_the_displacement_of_a_particle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20fec67-bfee-4ba8-ad8b-fe91865b71ab/toshiba_fire_tv_remote_voice_control_not_working.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144478185/87640572835.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 5340 bytes
SHA-256: 6ed0d2fe4960dd2043f30fe301a2f7f02f36499e9d6eca7f36b831f9d5791d72

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