Malicious PDF — malware analysis report

Static analysis result for SHA-256 39227adf0449b7d8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 00:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: daacee67d1db4b8d4953efbc0f34bee6 SHA-1: bf287773810c19250c9797793613ce0fc92a9b00 SHA-256: 39227adf0449b7d87696260d3e789bc9eb7378e5038492ec211b0b0ef94074be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, though many are marked as benign, suggest an intent to redirect users to potentially harmful external sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://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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