Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1d23018e94aeb0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 05:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f52d9e8863ca55b06a0019f9f3680b50 SHA-1: 7febbe98c34d2e15c443a90d73b6963f313a86d6 SHA-256: bd1d23018e94aeb0dc2b0ef8e527445c5f1bb8ade44ad79e6a4287d88a563a5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=android+write+file+to+sdcard+example PDF link annotation
    • http://fabrikando.com/cmsimple/images/file/wanafuboxawekezukutod.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/gosusorukigarimowajada.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc9b262c9---31201624225.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/sozuvusu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/99657369029.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/todolez.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/nobuwusikixivuwapitim.pdfIn PDF document text
    • http://centrons.com/uploaded/file/8023206761363f7940d6a.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/junusesefokiwileba.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/ramiti.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/69785770881.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/lavabukopevaxeliwu.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/kufalaxazixaxazaxepitokif.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xupejuwapalojawa.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/jivilafovezudoviwukeb.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/48191986080.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/65790751681.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/6316610737.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/74242443161.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/10489763162.pdfIn PDF document text
    • http://www.heksan.com.pl/file/40354993910.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cca8f65516---96997628955.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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 10948 bytes
SHA-256: 538aa68d9d165d5513bd3b2ac3bbca033f0ab002257dbf7018bda79879d5c9a8
font_01_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 16860 bytes
SHA-256: 0fbef523123cd3dc3820979ada6f9b57a7cec6fd465c8130551d005c4cf343f2
font_02_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.