Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9a97e574a8e61a…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 05:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 791d22b7626cca4df55ef3e91f4043a2 SHA-1: cfb2d31025855115632dbf1377260041523c5991 SHA-256: 4a9a97e574a8e61a65b594c05ed498f9e52ba89efc2c05ade9b443d3eef34a3f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking an embedded action trigger. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to disposable domains, supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://giovanniseneca.eu/userfiles/files/76817706000.pdf In PDF document text
    • http://dyglas.com/userData/board/file/dewotagiwinorusolu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gunojoso.pdfIn PDF document text
    • http://goref.ru/files/file/19378303882.pdfIn PDF document text
    • https://lecachet.fr/docs/files/28479694704.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/ralefifovowodinopegifoko.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/81842485577.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/090748148755.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/73985195878.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/34475097773.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/nijewekosajixigedazeni.pdfIn PDF document text
    • https://photofetimages.com/66142397630.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/rebunogolapaxawema.pdfIn PDF document text
    • http://bptramptour.pl/files/file/70861254254.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/wuxolenopo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed6d094dd5bf8a3bb384ceb9d3e362e6/bemomutojaxerus.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xaxotuvuvotitavafopisob.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8919695f0---fukemefoso.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/kujodiwazabutizot.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/dixivagunafub.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/lavonidejajapa.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/86107389621.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/74744642775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chemical+process+control+by+george+stephanopoulos+pdf+free+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_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 11536 bytes
SHA-256: b9fc7485c17e144400c33a789ed7da836083245f81025d9f9f9ba2f068fcbc65
font_01_sfnt_off0000c81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 14304 bytes
SHA-256: 730b50add672d67adfb3914bbd477fbf7c8687a69494fe4f5ad87372f0123494
font_02_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1