Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa13a00b1fa6308d…

MALICIOUS

PDF

79.7 KB Created: 2021-02-12 23:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ffb5dff5f281928ec4b61faef9b0456 SHA-1: df53e0f220084d517006b6c7080d5adaf926caa0 SHA-256: fa13a00b1fa6308dd161519beab67fde40d7863eced9fcd5a77723d43a693c1d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. 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 are indicative of malicious activity.

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://jacksth.ru/123?utm_term=evaluating+algebraic+expressions+word+problems+worksheet+pdf PDF link annotation
    • https://zimavilagapiwe.weebly.com/uploads/1/3/2/7/132712623/a8dbb.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/af4872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5fde218c90c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd67b38380c0.pdfIn PDF document text
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/e183f8a.pdfIn PDF document text
    • http://vinnipoh.fun/mercado_bursatil_definicion1vw6r.pdfIn PDF document text
    • https://lekinimogasujif.weebly.com/uploads/1/3/0/7/130739945/kumugusugem.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/towuse_runigamit.pdfIn PDF document text
    • http://stonersfranchise.com/autodwg_to_dwg_converter_2019_keyp2p1t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_5fd317f44fb6f.pdfIn PDF document text
    • https://lonirukigosoz.weebly.com/uploads/1/3/5/9/135965403/4817672.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/wejavagagiba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5ff870e18002f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/32453023510.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/dynasty_2017_season_2_episode_guide.pdfIn PDF document text
    • http://tofaveme.epizy.com/17888630656.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/work_complaints_report.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/bezegivixirutumuwedo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 5952 bytes
SHA-256: 7a700288937b5095c6f047a0506d27f5ef98119afa4db64ee206b5ca939a8f58
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 2536 bytes
SHA-256: 7a1296bf1b5c0c251319c28a5b5f8740fd50036ae9d78573f598699f97e0a7fe
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 11804 bytes
SHA-256: fbe9847f017b637587dfd60d218b35dfe9732c2ca9377a5e04b1cdccb45cb4ff

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