Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd31c5b6b6f6e4c7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-29 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ab0ff942b60b966872bcfc8d7a213ac4 SHA-1: 25213c8a98da908273411aaaba2736f7318ce329 SHA-256: dd31c5b6b6f6e4c7f1f81fb4e7058dd7357d5f59d13699943331935a78e548b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with a high concentration of links on disposable hosting, suggesting a link farm or redirection strategy. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=mac+android+studio+emulator PDF link annotation
    • http://brandorbit.in/userfiles/file/20743599097.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/buwukegonenivojakag.pdfIn PDF document text
    • https://askflip.com/uploads/files/38108940367.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/6351525799.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/19199385397.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/zisiwewojoruradi.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/nolaxemapoxilejegafar.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/85071527928.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/bewunibisavoligupujutez.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/12729595529.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/gawekiwum.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/61879630178.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/52090076978.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/13525985385.pdfIn PDF document text
    • http://agrion.org/upload/fichier/75722468859.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pojitu.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/11235040602.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/65628381070.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/lokurigem.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/josiwuvasogazuwanuzup.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/dulolamewanakelulezedu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/19765471230.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/34285339908.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/10141828377.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/89975272504.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/jalarebuja.pdfIn PDF document text
    • http://exima.kr/userData/board/file/lumemizikitetujuges.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_off0000b81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81C 17140 bytes
SHA-256: c95c98b83483fc50a83774dbd8fd3d4c83801594cf0db52fcc8d226ae21a0388
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10624 bytes
SHA-256: 620a1833c4080338834e5d0cb10e2ef2880be33134ce4c47796d9e21d1c5c261