Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ac8b4c36400825…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 03:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3178a2939060f5fc31b52834c25c4733 SHA-1: 54e96a47f4cfa604e1595420eb591a47daa89080 SHA-256: 52ac8b4c36400825467e3bcae0d807ca97104ff12c8e0473faf741414c8a3d01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to a collection of potentially malicious or SEO-manipulated PDF files hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://domainecomps.com/documents/files/57896300163.pdf In PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/zojutaj.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/81155652949.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131eca81119d---gotid.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/34287478929.pdfIn PDF document text
    • http://na3.it/misc/file/41621432686.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/pizetubufewajolivoretoxu.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/jagitadiforapuzogakom.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/nipubasaxonoxikekix.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/dewefolesubidelof.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/26474668918.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/tokafigekebilajirimagale.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_195655.pdfIn PDF document text
    • http://theponghop.com/upload/files/27292828230.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/3064134155.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/9563084569.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d678e399c---xawazakusas.pdfIn PDF document text
    • http://aimic.com/userfiles/file/20177065097.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/lolopakaseja.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/87040499973.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/xagitefak.pdfIn PDF document text
    • https://jck.ro/userfiles/file/60543742413.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/57699922782.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/jajapokomagegosadawit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mock+mock+locationsPDF 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_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 18000 bytes
SHA-256: d57ff1db066c619af4b1531a4ca7af7ca67c14903573a7d4b1fccd621f654db1
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10244 bytes
SHA-256: f06f5932887939864f6d5df2480a374740be1a8e16ad07544f8414565899cb08
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1