Malicious PDF — malware analysis report

Static analysis result for SHA-256 acae2ef4bffba530…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 13:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf2d1f295f58bcffc1adfc6b330c2891 SHA-1: 3e9d5689cb43baba9a018591e6d7208dfaa63b00 SHA-256: acae2ef4bffba530570a11d5de1c3ebfa84993cda52934d07f58a5ed1ed80ca8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to potentially malicious domains, strongly suggests a phishing or malware distribution attempt. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ydtmuhendislik.com/ckfinder/userfiles/files/51590182949.pdf In PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/jogelifelabifimiki.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/5718881565.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/goxikipuxelusawuderovew.pdfIn PDF document text
    • http://knipia.com/userfiles/file/97957182721.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/volusudinupuvetupir.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/fiwarujerigusekemekopasa.pdfIn PDF document text
    • http://kechengchem.com/upload/files/nezobivumelifaj.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/widevirurived.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191853087217.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/mazemebepomemenit.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/sojonapatipezane.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/bemewizijiwitovataloda.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/supubilujikop.pdfIn PDF document text
    • https://atrax.hr/files/razoravezitewel.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/31112651304.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/duzirikiwoxidapokutav.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/24639178429.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/sugepabodezurorivelu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/he8m1iava6vae2kesae7con8mu/fixadubokezidaboguwin.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090808124074836.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/89828646308.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/98784520195.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909065536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mobile+strike+cheatsPDF 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_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 10448 bytes
SHA-256: 53dcad6085422da2bacc383c3b28b9569e5591c36b7db1b37509084cbcf58124
font_02_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 18048 bytes
SHA-256: d13cd3a0b94e5c9beaf09cb078f58679b536f9ef4a8a485d05f1622a0a9adf03

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