Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb06a89ff47430b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 10:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d092bacbec3ce3c0f96eeb94598909b2 SHA-1: 674b5d37a24401a727acf3394885f945dd8269cc SHA-256: 6bb06a89ff47430b1887d3f0257ec326c295f498e00ba6d870044bc4f1b1bca3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, indicating a link farm or distribution point. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kueapem.com/contents/files/lazopu.pdf In PDF document text
    • http://www.hangmandigital.com/files/file/nigidesoforafoxokuvisixuf.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f93hpgjnbict9fkirocc8ojkc2/laputijovupusuxabekunux.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/wesowiginugofitopedut.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d98710d99de3b13de8c800f49deede53/guwipasavawakiv.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/44324528262.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tiditawozubedovu.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/ragofose.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/bumofur.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/rowanonogokotulok.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/sonobarufixixebojaponomug.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/81592843990.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/xuwab.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/muguwigepevodelax.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/kurosatatekemede.pdfIn PDF document text
    • https://lordoptika.hu/files/files/filelosimijera.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tadabigupixo.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/daserukujitodinukoj.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/77976666326.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/52159737703.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/xorulabomolepupusude.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/86389528012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=transcending+the+levels+of+consciousness+pdf+freePDF 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_off0000ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 11028 bytes
SHA-256: e1edd20b0477cd52ccd93aabbb0eb99798f515caac7f07b248b0e36206340906
font_01_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 18148 bytes
SHA-256: 782a3d2aa72b57d0b2202351094b5922e8918a75a30d8036385998780321d601

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