Malicious PDF — malware analysis report

Static analysis result for SHA-256 613deb7c9d1b6fb4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 04:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a71c00398f94164494530ed52b64fb37 SHA-1: effc8d3282a9508f6757a5bf0d81a976e40f458c SHA-256: 613deb7c9d1b6fb49bd9c86d023041e7d39700420cde390e4be88c2bd0cc7eb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://fluorescent-training.com/file/pigifudutarawukaboga.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/86919671119.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/91484780430.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/rupoxuvogunu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/juzozuji.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/91097216698.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/33372078036.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/32277722534.pdfIn PDF document text
    • https://davaocarrental.com/images/file/godurejapos.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/jevarufodiloxotusezasof.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/82442264118.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fawovikovukijojiviroroz.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/nunokegenovapetifo.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/jatimusovewa.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/midali.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/28037681392.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/ropugovotozefalunepe.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/85393041446.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/fesonapuxotefeze.pdfIn PDF document text
    • https://dptech.vn/uploads/files/78839976599.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/ladigonujadewamef.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/dubapimuvuwib.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/jiwixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=anime+world+app+downloadPDF 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_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 10356 bytes
SHA-256: 746925d3169406a56f0491a5163c892efb1065f67326f4c2ad0d92d0b9d6aba6
font_01_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 18028 bytes
SHA-256: 94777f82d984a46318259958fc6a05da7ead8e999503e6e2f62db36aad8e68da
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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