Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c7cc61d47fbde3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 21:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92cb033082513f8d86e491874c0bf625 SHA-1: 8fced7bd0ed6a5027cff3286a35e5888cd4fbe03 SHA-256: c0c7cc61d47fbde39c406068cc170faba2f78d4d639a371ccfe35c5139f5ca3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=robert+cialdini+6+principles+of+persuasion+pdf PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613029f89766d---niduronuzaf.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/nexakozetafes.pdfIn PDF document text
    • http://ruresept.ru/files/file/68622965347.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/rovunivi.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fatapexibokaratanuvej.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f032166c1b---goxunetudevep.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/90998659338.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/20889435438.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/tumowarixazexosubemet.pdfIn PDF document text
    • https://photofetimages.com/19952066100.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/15783121044.pdfIn PDF document text
    • http://apsons.eu/files/file/bokatemebimoxorukagelob.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/xubodoko.pdfIn PDF document text
    • https://senegal4d.com/contents/files/49178221127.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/fotora.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/3254763233.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/54386591427.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/wovexoseradenilu.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/85489182896.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/xiwabil.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/20967326313.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/zikapux.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/bober.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zejanowolozolatamubejapa.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 11064 bytes
SHA-256: 89bae3fba34cbd7a7108e8fc27ab957a0fa0cbd05c2d49d699cf8c1d0973b125
font_01_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 18448 bytes
SHA-256: 5eb4237c209b8100f1bce7f7ac4ba0aac8f145a8a155269eddca1795cefae7e2

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