Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27587c19c78e571…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 08:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1ed461f3895986e647eac49ec0d2c5ed SHA-1: 965e4faa378f49344adda4af61cce5f8cfece24f SHA-256: a27587c19c78e5719e332fbfeaec5c5a84c7243a11b4481cdd24df22bb51987e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=free+thesaurus+app+for+android PDF link annotation
    • http://koreaticketland.com/userfile/file/wokozemurejisepeketarada.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/livudamavudekozekosuzites.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/72808838039.pdfIn PDF document text
    • http://geotersrl.it/file/4034994971.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/89591833415.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/76957771096.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/14942033273.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/16752061799.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/dadodoz.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/87527823492.pdfIn PDF document text
    • https://schmitz.cz/res/file/bapuzadofabebudivumekit.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/39099468774.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/welosuxofumalofefufakos.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5e03f0200f31256bb61bf703c3765d46/wiramitabenovuvoxukug.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1n2t3lmkoo89bo07ggm8c7rm36/luruxe.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/puvofijogaper.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/59639659555.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/14522854101.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/nofovubabozizovixusatar.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/21279533043.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/42606958041.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jirexobumozujifarajujeru.pdfIn PDF document text
    • https://heyratacademy.ir/file/14566267672.pdfIn PDF document text
    • http://masonhn.com/d/files/pasidilite.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://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_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10628 bytes
SHA-256: dc87193c8fe1737d6d721d8732f85151d4275ab8de11747fadbe34740fc7e4be
font_02_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 17764 bytes
SHA-256: 70ac3c3986945b1031c0e0fc06d03e96eff78e378ca6d1bc34e6dcfd79919874

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