Malicious PDF — malware analysis report

Static analysis result for SHA-256 30870f4a24512bf8…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 20:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e449b758b19fa783b532922a2a9e5ca8 SHA-1: 6f6c9de2c5628f654520b034dacf14fd9e5abd2d SHA-256: 30870f4a24512bf8f1d47f05cd7b94b9f1a58c54606f73527b088deafe8e5ea8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which appear to be part of a link farm, suggests a phishing or malware distribution scheme. The primary URL, 'https://nomylo.ru/uplcv?utm_term=updating+to+windows+10', is presented as a lure for a Windows 10 update, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://nomylo.ru/uplcv?utm_term=updating+to+windows+10 PDF link annotation
    • http://aire-limpio.com/img/editor/file/kedakevegunagamorixigoba.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/67204309299.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/46943650107.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/14267221961.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/10000663874.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/89ed974bc4ba36e9c2002f850a7db29d/57486692779.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/47274629553.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/42023561317.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210918001512_y6cgh3.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/3320307021.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49250664956.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/selasu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/57797734474.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/jexapubufogisu.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/071653453503.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141914b1086e---fejogagol.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/gazenesabisozuvegube.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/muguripem.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/56460469546.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/15399351211.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mepokuvotowi.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/pegijigagodak.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/3456880359.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/22879230054.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/purokakugedilexe.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219112222199746.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_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 17328 bytes
SHA-256: c0caa115ab78b8543de3609dd0e370797f091f965389bd948a869efce8da665f
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 10556 bytes
SHA-256: fb22fda0d95814d00eef3ade00d8a5a287b8f4f26063910bd1338037dcc1b69d

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