Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a6647a5d6dd7ec…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 11:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db0474f67c84b7a25da810e4f1b95bf2 SHA-1: c338a108f775a9f339f55df61181c893646390b5 SHA-256: b9a6647a5d6dd7ecf14db0f5e01748e9d95c79df01766540ce8a3af508ac218f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and an instruction to enable content, indicating it is designed to execute a payload. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://esipro.fr/userfiles/file/tosepemojiv.pdf In PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/keguratew.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6c26bbcaf6a32153b0ee4475f82222d4/57670141492.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/16680615977.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/tajafibigil.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/rasizowedaw.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/29907860632.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sezabetulafoganulexowon.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/6332869510.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/marixikazaweriwatakesatuv.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/50155513671.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/kabigozimirazezoru.pdfIn PDF document text
    • https://iohrp.org/f_files/files/gelenonavubuzojosu.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/lolasuliw.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/fosonixabo.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021962027123382.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/38028435368.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/mibiwetiwezitedovozo.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/27850186679.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/66954460174.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62b3c1b87---77068482312.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/3717731068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=editing+pdf+in+previewPDF 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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10312 bytes
SHA-256: 9d195d36f0539d0ab10afaa95426df11a9b02c1735625f3b97849cc508a53f59
font_02_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 18740 bytes
SHA-256: c72f924743fa422c53541d8f4b3d8518f4972df975530e65bb721bcec16b24e0

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