Malicious PDF — malware analysis report

Static analysis result for SHA-256 d178c488979674ca…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 06:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8488a7203ca3a2f206cf5e6d63ea7350 SHA-1: ae12c2827d9e33c372a004b7d067c3f9d733a0c8 SHA-256: d178c488979674cad8cdb79e08f5fa27a66b814ff00f286694bb1e12dfd6b824
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://msinziniering.com/userfiles/file/34036871835.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/44672135124.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/6402782275.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/92163735409.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/lefadujamonunixezulusi.pdfIn PDF document text
    • https://norservis.cz/files/files/sekitu.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/13745528575.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/julonetomakotazigorurade.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc63e1a131---38647876655.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/93037958328.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/64573731738.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/4928807337.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fijuma.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/lulowasibevifanel.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f6e1fe70---95257357264.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/wijedupesak.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/wowejuzolitanilinutur.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/jajivakewavawogiras.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/48685305598.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/16933480552.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/39513509087.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/8246024263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=zenonia+3+apkPDF 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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 10060 bytes
SHA-256: 48219733ee8dd32d7f294ca8d7a1f2af9e0acf92bb533e71d89762bb2ce49a63
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 18928 bytes
SHA-256: 4e14a787670353514815e34be23a5164a73c52b44b7ee3041afa426927ee8460
font_02_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1