Malicious PDF — malware analysis report

Static analysis result for SHA-256 03224174fb97ac2f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 01:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecebc825fe84f220a353b4ba631ac44d SHA-1: 7680f91b022271031ce7f8301d9596d1bf9afe6b SHA-256: 03224174fb97ac2f25f5950907c7613aaf61576eff3b9cf41e9f3dd0a13a87d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to host downloadable files. The presence of a 'link farm' heuristic and multiple unknown reputation URLs strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=the+dark+knight+rises+game+free+download PDF link annotation
    • http://encino.kopanramen.com/uploads/files/78533200670.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/mufixa.pdfIn PDF document text
    • https://datajournonepal.org/files/dizudi.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/fesafanisuguv.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/74307532692.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/92858174490.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/betevekasasiwubof.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/15688481074.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4545c7ada---81281972537.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/laxafivofugodowugepexarag.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/71715497717.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/87077328858.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/1112263183.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/67380712113.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/kojowaxuvuvimadaxivovun.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/38643773841.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/kipasibimu.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/31509615292.pdfIn PDF document text
    • https://clubon.top/uploads/files/pejumuk.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/nujelupawatunigukuwarezuk.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/witujuvefezotef.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f220127115756d2c3b0126b7f73d1575/89094172413.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/82995360556.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/31298947313.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/likufubo.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/lipadikanarugutagut.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_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 17372 bytes
SHA-256: cd261b707c6fc866567eecaf07f84289a0c2197303078878d8e3043f61d17b27
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10940 bytes
SHA-256: 99332a27d7eaba41270ac5791458f71b97e670c565f46845f72b198962bc5339