Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec28922a1742f82…

MALICIOUS

PDF

87.7 KB Created: 2021-10-19 14:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9fec4f1e5dd203feb2d4870055c1b1c1 SHA-1: 8fd51d4bab572ba29edaaecbffe68922ec08fb12 SHA-256: 1ec28922a1742f82f55c4c8b577c94d6edcd79307bbaafac35009276c9cbbbf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://birotex.rs/images/files/76314126687.pdf In PDF document text
    • https://beauti-full.ru/uploads/files/71847303416.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sizuxok.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/38344242665.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/fubadowitunetotolig.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/11416244389.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/49884439812.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/vezupezesidezo.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/2508409569.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/pebemedizomanazakoledul.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3sp4c2pae34bd54fev1p3jvf26/wivenusogofijix.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/88443543093.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/wutoruz.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/wogawazavifupufowagumija.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/feperojusovano.pdfIn PDF document text
    • https://groupits.cm/uploads/fck/file/89318299890.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/37330611094.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/mituwigakolelosakazogig.pdfIn PDF document text
    • http://afinamebel.ukrkarta.ua/fckeditor/userfiles/file/muridixudisig.pdfIn PDF document text
    • https://fratellifurloni.it/file/37474356971.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614532fe2f0a2---60076412566.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/kamogal.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/satuziravenetad.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/41176046715.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/bibalawuvarepowezowasunum.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=characteristics+of+listening+skills+pdfPDF link annotation
    • 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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 18624 bytes
SHA-256: 14e751e5661cdd6660219edeeb6507b67af6022d985cf8d7b850d4cfa0793b6b
font_01_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 11020 bytes
SHA-256: 34d8bcc54a48d9b10bab824f27b6ef27d9cae5852866c5f9913154fd95b0040c
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1