Malicious PDF — malware analysis report

Static analysis result for SHA-256 4570ca5868baf53a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 09:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2545ce2875d82a0f8dd079626b3178e3 SHA-1: 71757dc3a8ecf6f2e0620fd5beeaeef3d6a5291e SHA-256: 4570ca5868baf53a5f63b5baa7bf01b17fd17571b690d98818f0f1f562cd983f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=super+mario+bros+u+apk+download PDF link annotation
    • http://szakkepzosiklos.hu/upload/file/xuniju.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/likisijifiwaxiw.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/38157385980.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/vanebawefulerusakadupekov.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/sokuralevuxigutoko.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/lujujilodiguvusatujarabaw.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/40795439361.pdfIn PDF document text
    • https://mauspro.net/upload/files/gitilafaponos.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/rujunolexagumu.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/nefepud.pdfIn PDF document text
    • http://skupka23.ru/upload/m/68104035965.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145cfbaefcdd---99430160075.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/16667632370.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/nesiwusekukowofim.pdfIn PDF document text
    • http://hak-al.com/resimler/files/25726966229.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/37315520417.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/kizuvuvifimibesuziwe.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7938cb305e418d03da9b6cc48620684c/seruvixekitobofurani.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/lobozasijub.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/gupojojusozutosa.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/5052236373.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sozezepawinatelazalutag.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/komorezuregazozubu.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210919_085634.pdfIn PDF document text
    • https://advik.net/userfiles/file/nagexekajokexuraxujij.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_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 20124 bytes
SHA-256: e53de6550c5b3341c7ee3224aec22a3d36028aacb0f840af845cc59b2f18d004
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 10948 bytes
SHA-256: 48d7d2541c8531738f31c9cc07c92a101b71b6bc8245db309a1be274597d0a9f

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