Malicious PDF — malware analysis report

Static analysis result for SHA-256 275290883ec6067f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-26 16:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18511d4d2135cdcfadd767aaa7f8a5ba SHA-1: 6883d51513d5364668e2d914545b275c0e1a6a7e SHA-256: 275290883ec6067f4566932b5aaa6569e70e647625808915d8e79aae04bb2873
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS firings, along with ClamAV detection, strongly suggest malicious intent. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a device account removal tool, likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=redmi+7a+mi+account+remove+tool PDF link annotation
    • http://pho32shabu.com/uploads/files/84820190793.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/fuwedefubilegoleb.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/21370579282.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/tajasitevomom.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/87914639642.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/21535953202.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xovugeduvitinuvozizedo.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/81499770800.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65b393e34---10043623326.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/wuledizagetomirubibeb.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140c068a7cf3---zagex.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/4818855885.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pefawi.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/raxatir.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/72388020337.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/suburuworaweg.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/zaxirixeme.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/96956822768.pdfIn PDF document text
    • http://ibb-online.ru/f/file/ridesagugudasefaw.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/dasumomatavoxasuruxom.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/10341914556.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/7127380133.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/getepekuvujo.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/33640411958.pdfIn PDF document text
    • http://vucert.vn/uploads/files/nojujazada.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/taxobuvarekako.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_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 10624 bytes
SHA-256: 40e975ea33c16cbbf110beb9f1963e28ff67faf1888cc5498791984222879e17
font_02_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 20904 bytes
SHA-256: 3e935304459dfa51d171186c29a80b2f1dcd7f0fe37d4db6c22040b681af1fec