Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1be1c7f682d885b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 01:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb4bdd3f5adada857a29e63586422678 SHA-1: 2dc7bde78d10ad13f79987331b4ab2b1ff297a86 SHA-256: b1be1c7f682d885b4af7965b13dd70cf2b2c9917d78571821044dab53bc11edb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. The primary suspicious URL identified is http://ultraljud.nu/bild/files/girudu.pdf, which is likely the intended destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ultraljud.nu/bild/files/girudu.pdf In PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xupukovekix.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/fapagavibufolisamefebi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/tewixowenefozepanuru.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/62600075134.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/71257748779.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/21506693262.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/nodafewo.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/75287398696.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/41394075816.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/wavuzemabafudoloranatito.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/rufijizeseji.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/36170344564.pdfIn PDF document text
    • http://vodnik48.ru/content/file/beminudavejizunawizujewav.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/womurokepinim.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/gukenexefaroxibojon.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/71830030507.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/dikatepolewotowa.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/xapobep.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/netajodipeku.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/boxoguv.pdfIn PDF document text
    • https://digireg.pl/upload/jerel.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/tubapose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=www+gta+v+mobilePDF 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_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 10364 bytes
SHA-256: af52eda64cfa56ff3b5060c8768cf65f97e797b7944464ab08edda125d9d1b13
font_01_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 18020 bytes
SHA-256: ebce662ef8a5356fd8fcfc9092648ef5e1da7f89b3dff7dfc1c1f841caeead7a

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