Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7eff562af78b604…

MALICIOUS

PDF

87.7 KB Created: 2021-09-11 22:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3005e6f278425edb791f66cf671ed8c9 SHA-1: bd88d3fd5ce9e0ef7a4c574c3d841a1d18bc14d6 SHA-256: b7eff562af78b604aa5ca0f58b883ba90027a67435c6c1481b9a20fd49f68503
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and numerous external URIs. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code or redirect the user. The high number of external links, many on disposable domains, points towards a phishing or credential harvesting campaign, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=electrical+calculations+lite
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zetajusafibela.pdf
    • http://daoltrading.com/userData/board/file/22079119880.pdf
    • http://mtcnx.com/upload/fckimagesfile/36454022581.pdf
    • http://conservativista.com/js/ckfinder/userfiles/files/wakebisat.pdf
    • http://kristiankutschera.de/userfiles/file/38447141647.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/83364269430.pdf
    • http://modero.vn/upload/files/dagizatisawonekafebudu.pdf
    • http://aaykpn.com/uploads/editor/files/45280262445.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/nirumenovalutef.pdf
    • http://kapsalonindex.nl/images/uploads/75043637220.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/wopupawobiwukak.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/mofaf.pdf
    • http://snabsz.ru/ckfinder/userfiles/files/57499154429.pdf
    • http://benetalent.com/upload/files/fuleja.pdf
    • http://tydafa.com/dafa/uploadfiles/20210906112333.pdf
    • http://ortopediaszombathely.hu/editor_up/49664248418.pdf
    • https://clubkdo.fr/img/pics/files/rijodadetegozuwaf.pdf
    • https://somogyplusz.hu/files/zoxejowirogamimokowav.pdf
    • http://ocean-ex.com/images/blog/file/87367731235.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314a98cb09b---26689316491.pdf
    • https://sindonis.com/userfiles/file/15041268527.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/35406536923.pdf
    • https://marblo.marblobaths.ph/app/webroot/img/files/45746619253.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f103.bin
17254f9e9ac9bdcaab1c8a710d12589417f93cfb243fef9600f9e0306d884abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 10308 bytes
font_01_sfnt_off00010857.bin
2e3c855b91d7234e49a8b0930e184c98d46588a63f05f8c62972a3150683d328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 18964 bytes
font_02_sfnt_off0001398b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.