Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96b641aed81f377…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 11:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f26837f81f4b06e5dc8820cb60c6a75b SHA-1: ba4ed35418ba9b1751c2e9289b855471806480e7 SHA-256: e96b641aed81f377826dd31e1d0cb027bf8abea8afff6c0d73ca9cbcb15b9086
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://beautydiction.com/ckfinder/userfiles/files/torifetumurof.pdf In PDF document text
    • http://mawratanews.com/armedia/uploads/files/37814281611.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/26480136312.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/47135402489.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/vazupasu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161540be1586c0---pozodaxireziveg.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/43967994431.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/tikital.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/13081251623.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/xosusiwejezov.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/kumolanapix.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/62163227065.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/58241975212.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/fudakuliligagixodabaxusex.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f4da356d3103ff377670e2f1a2999e19/gigerig.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/mevigol.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/33751542018.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/55874060119.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/30071428553.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/46359589275.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/wimimifogibil.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/ludisorononasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+reduce+the+size+of+the+video+in+androidPDF 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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 14780 bytes
SHA-256: d04e8962f6dee05d19873688f0d8db6439e6fbe8b6eee58a33e0ba6b391460ed
font_01_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 10828 bytes
SHA-256: 19c5e11d480fa860323ce629b1684fb977db7c461a7f99ab1d6dd8e7e8a4ece9
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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