Malicious PDF — malware analysis report

Static analysis result for SHA-256 008f7235a321d34b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 17:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67c6a203ea9636fb2b1aff65ab77a84a SHA-1: d14b336885fb8bec2aeb531f35e5fd8e77358bd1 SHA-256: 008f7235a321d34bed53c0051c51b03844a8ba600b70309e4897fc117f1a5650
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://searchlink.org/userfiles/file/89940322009.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vobixitin.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/16398052724.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dejep.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/vuxivipenetil.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/xejodiwupisivej.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a92168fb---80757257071.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/68869665363.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fukewe.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/91191246274.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/45fd827b6cbcec3c2612bd48796a9b67/6662951842.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/45712385091.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/pafumozuzu.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/72993496396.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/68430256694.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/senexerowaxajek.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/barazesafasiburito.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/27507186976.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/nutarivagaza.pdfIn PDF document text
    • https://koratspring.com/upload/file/zapovemimexukezununo.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/koniwogowunap.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/49502260287.pdfIn PDF document text
    • https://novitas.ro/files/noselinanifogat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=c%23+create+pdf+filePDF 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_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 18452 bytes
SHA-256: c0ce3c3992d1122e014d90f63f0a9ae6a713f6188abec5bf0e94ce762c082df9
font_01_sfnt_off00011719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1