Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2822b038ce04236…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 19:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0fccb8a278314d3079c16f782505fa1 SHA-1: c5fc22b0800ba517218e27ee53a2c69596f7d18c SHA-256: c2822b038ce042365f2b478b7911801e5bd2b332d9b81c81dff4db5d51a62ae4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to suspicious domains, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, but the presence of JavaScript and the link farm heuristic point to a lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crocepadrekolbe.it/userfiles/files/loladulizafigodazevitaf.pdf In PDF document text
    • https://mabuksusu.com/contents/files/nomidejeripezikutali.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/32079335534.pdfIn PDF document text
    • http://ch-yang.com/upload/files/fifufolipodasukadu.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/gexikosazorar.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/50328760822.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/kosukogigexumof.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/72587175462.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210912141957.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/92545256400.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/duralubovugotigubukeni.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/25443442359.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/puxazaz.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/63657338660.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/zepigisavokuf.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/68097042003.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/79996858611.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614438b0314e6---purajo.pdfIn PDF document text
    • https://jagominum.com/contents/files/60397636197.pdfIn PDF document text
    • https://webrobogo.hu/kepek/ganiwukamidogesa.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/sazipazolalulodewaxalu.pdfIn PDF document text
    • http://moneymaker-gold.de/files/98940964877.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/sojenudobukimafisogaw.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/rojakemozikoturogilise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=device+verification+system+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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 18680 bytes
SHA-256: 82b776e055500867305fe20601ebe3948e26cedffb61e23223086db1921006bb
font_01_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 10868 bytes
SHA-256: 534f3555bdb4dafda8dc59718f74ce6803975fd5a56ecce10e5c15409fbc8683
font_02_sfnt_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1