Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cbde74ade105bf…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 09:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8b69df136c7051dc52699e4261c7aaa SHA-1: 1cd6552502c75035a65a9882ce464dc36853d8df SHA-256: 72cbde74ade105bfac0fe09ea8583b8c913d3df97fbdd1978eed7b41c5d696d4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically flagging it as a password-protected archive lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload, while the archive lure aims to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lotte-ppta.com/beta/assets/file/fazadopu.pdf In PDF document text
    • http://lex.tj/img/file/papapu.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/79076089597.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xigimegexax.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/18430301563.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/59520937759.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/87653123360.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/27066947239.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/70372657174.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tomaz.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/38626344139.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/vexafufin.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/73196076753.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/5280617274.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/70155022657.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/subanefoxeluwedarogiz.pdfIn PDF document text
    • http://grandfiltr.com/files/file/68064811468.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f02db029112ac573fe203574d0748320/xovukofometup.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/94701242698.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/dawizopodezajad.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/49441493709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+pokemon+alpha+sapphire+for+citraPDF 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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 18288 bytes
SHA-256: 3864c6b82bb6f995f8657c49448f8c421c39fc59de59215f0eca2a6a4cec3468
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 11064 bytes
SHA-256: daf9a71d468bfbe5d86061a3196e63747b33e1d7713bc308578c063d10cdf5b4
font_02_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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