Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4b35ef9d8b3a8a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 20:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c47a6eeaa706a64965e380d14cef81fb SHA-1: f7e89f308801780df911e77af62e66caed149e93 SHA-256: ca4b35ef9d8b3a8a869b643c397bae7e0248564379c0fcd9ab1db027f27de6c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with specific detection as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming attempt. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=the+free+skins+com+generator PDF link annotation
    • https://sharmtocairo.com/userfiles/files/xowosumemif.pdfIn PDF document text
    • http://viorina-deko.com/images/file/33385257151.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/gumimugezur.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d462a08e---65021262972.pdfIn PDF document text
    • http://rhondachem.com/d/files/14887042273.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/toladorikamurepiwizaxula.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/pinoderexugizexinij.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/6490213930.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/79955906791.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/34749161626.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/43804186182.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/ripodufosubuzigipoxitu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614857905eebe---55340561787.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/4751110909.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109021312326581.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gatunobo.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/77460150279.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/19149819183.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///zosimesixa.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/75447225082.pdfIn PDF document text
    • https://12shio4.com/contents/files/bemev.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/guzep.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 18372 bytes
SHA-256: bfcf497ed4b693a6b65b2499f789894d7d0b5bca4e775bab3e9ea5775ace8997
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 10792 bytes
SHA-256: 3d4d3b1323fd69364f1ad7e904447a082ef97bb39c6a191dfabdfa031397e25a

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