Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fdf9b5e60d26c8…

MALICIOUS

PDF

73.5 KB Created: 2021-03-04 18:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4c215e964123905df8f2d85fb947e0f3 SHA-1: 8b761efd228446608b02f16b9e5717e7ba16a0db SHA-256: 89fdf9b5e60d26c8318afec2197116fba8db3ee4ca97b2bda2e5f16b753f7a99
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The heuristic firings reveal a significant number of external links, suggesting it's part of a link farm or SEO manipulation scheme. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=how+to+study+organic+chemistry+class+12 PDF link annotation
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/bikinosizaviz_muloxunurufe_somegadus_somejo.pdfIn PDF document text
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/47326dd7f708269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_602591f4e9971.pdfIn PDF document text
    • https://zibozofebar.weebly.com/uploads/1/3/0/7/130740265/redubew_libilapupidov_deduzewofaja_zibofojuduwum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6040bc4344ee7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fcf001a56d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_603d256785f1d.pdfIn PDF document text
    • https://nanijufofif.weebly.com/uploads/1/3/3/9/133999758/0d10003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxesixipom.epizy.com/42227991224.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_8a48edbda6a14f678389f50c2eced97a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/how_to_measure_fracture_toughness.pdfIn PDF document text
    • http://pakafadudu.epizy.com/avast_antivirus_free_latest_version_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/61736965176.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_47d66e48d458461ca6c14b34f6f38cef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/vazipafovu.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/xarazusinexovemepesa.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/object_oriented_programming_javascript_medium.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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 5692 bytes
SHA-256: 45e5ae3868951e125f8e01911b81f1a58e6486d5b0169f3291c3c33bb395f80c
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 9676 bytes
SHA-256: a955d947d369c7525c7dad175f767a416e65c12adb77c5ca29d889c7ce62387e

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