Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f4a97471205b91…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 00:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d357a66c79464ebdaa550133d62cd31e SHA-1: e0104837ad83e7abdef4b0c166275735f8d72103 SHA-256: f7f4a97471205b91db4910217de2a4ed987a5b8ff7b3c4096f2f1f495cb673ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as a phishing trojan. The presence of external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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
  • 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://szabobuszrendeles.hu/files/files/12272065216.pdf In PDF document text
    • https://happyfun.tw/uploads/files/202109070824031516.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/96077386134.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/lepamod.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/87311985099.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/36409596356.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/37890105530.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/pexaz.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/vajot.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131f393ad614---62550309102.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/fikuzerejakozibili.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/niforulu.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/63300077998.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/81239385512.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/83540406853.pdfIn PDF document text
    • http://hybsch.it/upload/file/zobomifufin.pdfIn PDF document text
    • http://linker-apps.com/files/71274981964.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/tokene.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/nixevudevosibudanuzelemux.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/kolixudag.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/tesijimobixeboxalebefukam.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/ripekajejefunaze.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/4463212024.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/54821026300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bobol+password+wifi+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 18412 bytes
SHA-256: 1030620665de169fdb90a02d8e048dc30702be15f960121c1e689c6334eebef3
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 10540 bytes
SHA-256: 216e78b286c6b5d51ce9e55591f54848b0a9ee59cef145d0fe9a96e3a8309ee8

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