Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17f64780e6ebf45…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45494320482e9ba520bd62a67d9df225 SHA-1: e37d16a476192284dc4679445dacfc4879ec0177 SHA-256: a17f64780e6ebf453e1dd0d7c9db5288d36fb2694e839e685c5a8e7e8c3d1c7f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document's primary purpose is to host a large number of links to other PDF files, likely for SEO manipulation or to distribute further malicious content. The embedded URLs point to various domains hosting PDF files, reinforcing this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oa30us.com/userfiles/file/47571533462.pdf In PDF document text
    • http://biancoacolori.it/userfiles/files/jesogukov.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/76174847266.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/853907590.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/650c66a8c68f80c625b22b9d87900b72/guzubusejijowixik.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/16949365842.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/13075082805.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/8972785658.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/gakepodejagemati.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xowipo.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/45881842688.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/23871622625.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/55497168422.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/dulakepiwupax.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/47586372765.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/nagefurebip.pdfIn PDF document text
    • https://rinducm1.com/contents/files/44055225327.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/dalolaboferejijiwajopek.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/kupekafafetirumuk.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/danebobatemigino.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/90197345553.pdfIn PDF document text
    • http://dobski.pl/userfiles/file/41832374392.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/dexax.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/fapinegasifakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+bluetooth+audio+codec+for+androidPDF 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_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 14848 bytes
SHA-256: 9cb2011c2a300760af31809212592e0c055e47361d438f0c823896ef35260d6f
font_01_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 10868 bytes
SHA-256: fafdb313cfd0112806cda9c6e13cbc64ad341e3890a4d14cb0741f08f2c69a32
font_02_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1