Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd5ec4846e763a4…

MALICIOUS

PDF

97.3 KB Created: 2021-09-16 05:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b680bf554595514997234f0eb8d0faaa SHA-1: 477c9bb59ebb302fc2ac70118cfded65d80e6f53 SHA-256: abd5ec4846e763a41994af3d0b688d0aa006eb0391359e1cc539f5a4f81eee7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The PDF's structure and embedded content suggest an attempt to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://cructi.ru/uplcv?utm_term=san+francisco+font+with+emoji+ttf PDF link annotation
    • https://www.abrasco.org.br/ckfinder/userfiles/files/gavikubedubibolebepija.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/zaboxe.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/mupugogitakejasugewaxiguf.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/44240279652.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/65735152813.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/69899415588.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/45031745457.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/64858523598.pdfIn PDF document text
    • https://castel.ro/userfiles/file/gomomaver.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/fugupufagubotibupojirola.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wokuzolonudakuzeboku.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142605dc918b---7834384454.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/4834626065.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/91019268304.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/86391798206.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/7711105117.pdfIn PDF document text
    • http://synhbio.com/upload/files/75660711322.pdfIn PDF document text
    • http://linza-market.ru/upload/files/91310465136.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380047d0883---wovetogapulali.pdfIn PDF document text
    • http://geasit.it/userfiles/files/ruzuwebe.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/dibigewixa.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/12683940710.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/66009784701.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/fuwepezojewaneri.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_off000111b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
font_01_sfnt_off000129cd.bin
243561884f9101c8a21add32cdbc1f994a7f351fc91c7913d44ea0256d9cc1d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 10844 bytes
font_02_sfnt_off000142ae.bin
c48323f77fbffee116475f4d4b02c6daadb2463e77e71275c0a7f21ba37d28a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 20300 bytes