Malicious PDF — malware analysis report

Static analysis result for SHA-256 df41abd2f386a7bb…

MALICIOUS

PDF

89.4 KB Created: 2021-09-13 19:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34a7610797d60f555801ad668b26f555 SHA-1: 5e92b3f9bfe4e04b7280f00535f638bb7ff96f54 SHA-256: df41abd2f386a7bbe9f930a703cf5bc65dc59b485a4d64a57d6335bb2233c7a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one with a UTM term suggesting a lure for cracked software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous distinct links, further supporting a malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=adobe+photoshop+latest+version+cracked+version PDF link annotation
    • http://woykoff.hu/upload/file/tajozaxefajuxobewavinupa.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/92540222399.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/61731861769.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/mupemufexolulafa.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/wijedabekare.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-5/20210905093104444730.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/dirabitogugibur.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/tewupifibumobopasujivoni.pdfIn PDF document text
    • http://nensi.si/upload/file/37084368327.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/85242695622.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/95bd635d590e2fa5abd35f27cfca6c08/bojedatapusibabi.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/68915598404.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/23389196621.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/nalibefuvakenaranisiri.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zugulavadavimonogusidi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/613390e2204c255d6549f07c6e9e1f42/kamolalapojanuxivip.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/nixobiledajalopagofo.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/37193544660.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/wakemusavo.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/3874593611.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80081581286.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/lumerimanugunuj.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/1437924543.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210913140405.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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10888 bytes
SHA-256: 7b9efa78b9a5b1a16fe3fe368cbaa6005822849ac3057981de696fbc13775fab
font_01_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 17652 bytes
SHA-256: aa7a5180e1c0177f80070c0dafc77913bd8bae1556f5a4c878e825c7758e5a57
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1