Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e940b6201a590d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-23 18:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e87ff86a192055d53e7726a1dc6c51d1 SHA-1: 18159ef621f91d3f9354a4baa0057ada38f54488 SHA-256: 94e940b6201a590dc3e47ab4ef9b9315755ab92b8e5a3a6d22f8d9e7bafe9046
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crcnueva.naturasoftware.com/uploads/images/files/fesivasekulusatigos.pdf In PDF document text
    • http://climacom.eu/userfiles/files/14571040114.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/bujipoke.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/5004494102.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/povosep.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/67947037192.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/dufagenenozikaxisezaduta.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/koguxepigazadafot.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/jixisokokimurik.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/22922209485.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/97821829557.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/sesuserokafavegarobam.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/79027332460.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/nufenixowiwisegati.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/wiwepuder.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/vosiretij.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/61942671998.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210905175117.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/53405168436.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161473582a4734---76936807082.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1oj1uj5f7gbi19rq9uigb16s6e/fozexajepurodubikiv.pdfIn PDF document text
    • http://c-amc.com/upload/files/luderevesar.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/51819267622.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gizeg.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fowowajitejifamita.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/16291040091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=airline+manager+unlimited+moneyPDF 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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 16712 bytes
SHA-256: 6007da2ab7606d8725211dbba9856f8ef5704e3b1f6608467b67cadd92b686b5
font_02_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10620 bytes
SHA-256: 0f2393bfb6b0073b4527d47756e89f0857cc943fcf220110b2a303cea0910164