Malicious PDF — malware analysis report

Static analysis result for SHA-256 221e9a011ea46761…

MALICIOUS

PDF

91.4 KB Created: 2021-09-18 11:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2df5f8c7d18afaecf0f7923c80b29970 SHA-1: a894865d9883ef881de3afaa135bd39c0605664f SHA-256: 221e9a011ea46761f2be77980b43b0d628a0e30534453daa265af95d88d368d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or spamming campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pointvirgule.ca/upload/editor/file/natakukupo.pdf In PDF document text
    • https://artedelvalle.cl/gal/files/file/jitodikilisokedadu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/fb5ef76450f6a3f9b3e47b63c33726ff/23956427657.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/fiwesozujufar.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/36052073604.pdfIn PDF document text
    • http://neteyes.eu/editor_up/52269263237.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/27192206321.pdfIn PDF document text
    • http://furniture83.com/upload/files/damegeruduwif.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/20799541291.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459f866b889---xepetiv.pdfIn PDF document text
    • http://lulanjina.net/upload/files/norawomamumimonazukafuzi.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/62632347379.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/70592385910.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/55400833150.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/13923683086.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/bojatugowogixige.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210915174742.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/xikopokuxirosozajuwu.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/sulodirofitisoloxi.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/58263384995.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/mulapoxen.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/35838394512.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tisedutegifekevawexuvufom.pdfIn PDF document text
    • http://actinq.nl/upload/file/55267850344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=thenewboston+android+tutorialPDF 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_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 19708 bytes
SHA-256: 2df7182a832e21e324c6103e9a1100648d2219692ffb4ea9f19c09fc2356060d
font_01_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 10632 bytes
SHA-256: c322c6475233ff7b5214f56e44771925afc65278e9a83c8d6e8752262d8586e1
font_02_sfnt_off000147e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1