Malicious PDF — malware analysis report

Static analysis result for SHA-256 27414cd92e8843b1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 15:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e93a2d00519329f4c68c99b313ccd8b0 SHA-1: f0747a36994cad3d6d50b07d75d2911bd6941a1a SHA-256: 27414cd92e8843b17aa2a61bd6dc2c2bce709f75adc7879b5743cf8246f446c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

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 https://krisoc.ru/uplcv?utm_term=minecraft+apk+hack+mod PDF link annotation
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/94627080656.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jugivobig.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/12700852832.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130960b582cb---10527638388.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/jojekemepeweki.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/6530505031.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/24393956720.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/sejoxotifedakineloxi.pdfIn PDF document text
    • http://ipceurope.com/assets/file/56144123770.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/poziwagafaxupixisujeja.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/40492181066.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/16643641411.pdfIn PDF document text
    • http://cartopack.com/Images/file/wemonadutogedotuligegujar.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210908063233.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/49875311643.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/37846027970.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/buxeju.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/bewolapunudutupigabiza.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/38088767813.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/90637138319.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161317816e02a6---61155375410.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210909_074751.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/xoxitugamoselitujofo.pdfIn PDF document text
    • http://inercial.es/uploads/files/43031195936.pdfIn PDF document text
    • 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 17904 bytes
SHA-256: eeb6431965c49e4717538f757567ec754759234355c7e27e14d0e4ac2463eb58
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 10756 bytes
SHA-256: e1667ba56899431b741ad36508cb101809f14d59609d1e99eb83248c066ea05d