Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8c61611ba040b6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 12:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73656e4afbce34f8ca69d7ff877ff9d1 SHA-1: bfd46c3c7dd081f9c52f674680a141a4c4501903 SHA-256: 0d8c61611ba040b6732f489984f3e47dadbeb6136e81d6b7f0e62528786308af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://al-bandak.com/userfiles/file/53226851769.pdf In PDF document text
    • https://faresaldabbous.com/uploads/file/20635451755.pdfIn PDF document text
    • http://tdbm.vn/upload/files/bodobukurilenete.pdfIn PDF document text
    • http://reichspfarrer.sk/file/gawoleluwu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/16266605614.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/sezenukeluvonaw.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/36727906491.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/43692234390.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/81845907924.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/97149590571.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/90416259471.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/12328867445.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/2471880335.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/68847648606.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/nupebezilipexalunujopezul.pdfIn PDF document text
    • http://briztravel.com/upload/files/gejipugenejovomovumoti.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/narakewimuxote.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/14777763410.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2c5fa28e088cb8d2eca334a251683481/66580399356.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/xerawavodowuwiditetidada.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/787ee03eaa21a0efd6013c44ac3ea527/75741157473.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/43589113674.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908134410657053.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/79498090405.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/jidajewe.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/senupajuvanigotejediba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=historia+del+tahuantinsuyu+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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 10800 bytes
SHA-256: 8b0bb01c73237d6de01f68b2605ba5c76c8919305a7fef11f93c306325e7eba2
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 19516 bytes
SHA-256: 0edaff13d7f2b991acf79c65e53be3502c9b0c696eb94273c25181db9fff83d7
font_02_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1