Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0ece67ed98f025…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a803223a8d36b4a31ceb2f26a4019d4 SHA-1: fbe085578eff84235f107e20a5c733493fc41954 SHA-256: ad0ece67ed98f0257489712350e69fcc515fde774ea30bee8c47aa6b3fa63803
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The presence of external URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' confirm its role in phishing attacks, likely serving as a lure to a malicious website.

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 https://smidgel.ru/uplcv?utm_term=plea+bargaining+definition+pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labexilarilijotibawekimu.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/62409078058.pdf
    • https://confetti-seasons.ru/upload/files/85977743205.pdf
    • https://eclearusa.com/images/file/wojew.pdf
    • http://igabana.com/upfolder/e/files/20210907172358.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/51552984852.pdf
    • http://ansing.nl/userfiles/file/76152593668.pdf
    • https://ajitcoatings.com/uploads/fewaxogekipolapifole.pdf
    • http://fiumaradelsossio.it/userfiles/files/gakegujesovirexowosuzag.pdf
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/2307450911.pdf
    • http://esistore.com/userfiles/file/kinaxesedire.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/88403056347.pdf
    • http://drivescuolaguida.it/userfiles/files/kexofogujukaruboxelo.pdf
    • https://slezanie.eu/userfiles/file/42026408302.pdf
    • http://glttek.com/userfiles/file/dajusobajowezozabu.pdf
    • https://truonggiangcompany.com/userfiles/file/mepewupotitezapopubav.pdf
    • https://vonia.mikludava.lt/images/files/xarapabafefinafel.pdf
    • https://homestayhoian.thamtuddt.com/uploads/image/files/58569503621.pdf
    • https://lrsinc.co/userfiles/file/lepijo.pdf
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/17631397861.pdf
    • http://sutipatika.hu/userfiles/files/24639178429.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/46203528984.pdf
    • http://sjhtractor.com/d/files/56300592536.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe5.bin
71772ffd9761bd871f0225f3bb1e9d77cbb50ad5ada539c98d82dbdfac4fdfaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 17476 bytes
font_01_sfnt_off000109bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 16792 bytes
font_02_sfnt_off000121d2.bin
30c6a9fb8bb3c3a64ca4a89fc1c6d446b9d832045cd43162066660f225c5849b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 10648 bytes

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