Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a49686e62145d9e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 00:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09d195eabc5a43803d6c8ad816e95f4e SHA-1: 7b2e6a2b12939746c14260a0a52474527c6c218e SHA-256: 8a49686e62145d9ec01a012f961937f92bf81a85f599ea94d437f1e6ff500207
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, indicating potential for malicious execution. The PDF also functions as a link farm, directing users to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript and the link farm structure strongly suggest an attempt to execute malicious code or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://condosworld.com/abisol1/userfiles/files/vawekoxen.pdf In PDF document text
    • http://upakuika.com/img/file/ritut.pdfIn PDF document text
    • http://ipublicity.cz/data/file/52173290744.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/88037838224.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/29029063984.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133791368880---pizofutufutinetifijoju.pdfIn PDF document text
    • http://normel.org/files/upload/file/kasapidurelubu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/wipawopozixa.pdfIn PDF document text
    • https://rafautama.com/uploads/file/32617490643.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/midipogulemubizil.pdfIn PDF document text
    • http://mfahk.com/upload/files/bivamudaxonarigof.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/2625799868.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dikas.pdfIn PDF document text
    • http://strandedtattoo.info/file/5791789551.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/sixaxemadajixerixa.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210919064714394216rsgbg.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/rajoj.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/9246437069.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/65391788878.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/96498846084.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a73766b0c3726c1b0dc642b058b69c18/nijedake.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fubesarit.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/39813222597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=root+android+xiaomiPDF 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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 10212 bytes
SHA-256: ac88c5ae1cb89d96d524cb0fea81f8bed4e4f3cfedd287c03dcec0359d16ecc6
font_01_sfnt_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 16364 bytes
SHA-256: 2d0a8aeb298bc83c3985ae5b4a54c98830da3cafc3399c84b9a4ed10a952584c
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1