Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc967b6064cd9008…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 22:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: defa9c8fd1d005c49613bc1042a98b4f SHA-1: 09a4ee619f2a739820fa9805ec7cb091ed3695e4 SHA-256: bc967b6064cd9008e4c8b4e797dd782fcb45423ed4328273de3e595118d0fcb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=happy+bay+games+apk+download PDF link annotation
    • https://at2-turbo-j3t.com/contents/files/siwapanugatokugixifir.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/nitoximux.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/lalujuzudedesu.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/xukewosotetizoxodezizapab.pdfIn PDF document text
    • http://megalaserasia.com/upload///60292613657.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/19821615730.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/dojazokururuwadu.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/kezekeserivibisoxebulixa.pdfIn PDF document text
    • http://3asoft.vn/img/files/74692152423.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/98633084748.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090204500392.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/jamedakapir.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/8866799576.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/4854897643.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109042037555381.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109091257094143.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/47300310458.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/91413474073.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/40128569527.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/fogozusetufipag.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/dujoviporopatajomanivipok.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407b52bad72---12411717368.pdfIn PDF document text
    • https://businesslife.com/content/files/84552309151.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_off0000b59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 10868 bytes
SHA-256: 04db773c15dc232235a538260f82ecc255befcd957a2af44c7216492d024f0dd
font_02_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 18596 bytes
SHA-256: 4adb9214b8051213f0918da2d55aebe415de969e79cb1e83ac71b25de0167375

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