Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19aee8381baa37f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 01:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d5389f33355775e0efaef6918275d4c SHA-1: 33398508039a7d24b59dcc812b02a7c05710555f SHA-256: b19aee8381baa37fba5ad711b6b5f10864d83b2b8c2048281cff9ba951bb36ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=present+perfect+past+perfect+exercise PDF link annotation
    • https://perfecthospital.org/ckfinder/userfiles/files/dekasefe.pdfIn PDF document text
    • http://sbcnepal.com/images/file/sexitepa.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/92508483639.pdfIn PDF document text
    • http://thegioioto.store/upload/files/savadejosi.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/1626554138.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pozoxexiziroponifokan.pdfIn PDF document text
    • https://network-italia.it/file/zefiranukajegokupalipurul.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9343cc259026a06f711508388dac2939/jufovu.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/57431644502.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/judosedexi.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/dadadetesaridege.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/50435813186.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/60301733933.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109190411308353.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/vipowabikirifo.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/97048342090.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/12989761046.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/70695063538.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/79186030867.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bb8bcf7ffc9fcb1b00c83413225ec9dc/binemexujorarini.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/80031238338.pdfIn PDF document text
    • https://stotex.rs/files/muribabimarizo.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/7931945485.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_off0000bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC95 10412 bytes
SHA-256: 27b1c6b1b7b69c143d86ca8c4fa363bd31f79a28fe322a3ec7f9282ab5b6fb52
font_01_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 16084 bytes
SHA-256: 636d90f0508522e024ce24f85a045ff020f316cf3200a96a9afd281720851aa6

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