Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6985d8dcf91d52d…

MALICIOUS

PDF

96.2 KB Created: 2021-09-09 21:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7162afb34d05b8cbd56c6b0909a6e4a9 SHA-1: 48c3e8a7ff9f7042b850709ef80d5fdb0f6e5313 SHA-256: e6985d8dcf91d52df299e1c41ef7dee5b3e93a5256c8093d81253eb12b851b5c
126 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous links to disposable domains, indicating a link farm designed to obscure the ultimate destination. The presence of many unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://vswet.ru/f/57648517465.pdf In PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/najuvigufagikuserupir.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/nilofirujajerig.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/risulajamopa.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/sagola.pdfIn PDF document text
    • https://afayl.com/userfiles/file/14828940004.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/4703499226.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/40223814116.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/dirujanagi.pdfIn PDF document text
    • https://senfina.top/uploads/files/41359756433.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/14487456243.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/vupitedul.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/13141727071.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/kosifu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e2ea4c2b3---18320681454.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30445077048.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_111748.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/98968148454.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/belatakexudozekurujofevak.pdfIn PDF document text
    • http://ducnhua.com/upload/files/jadizudipotasimoviraref.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/7255150737.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xowitade.pdfIn PDF document text
    • http://szjg.hu/images/file/puberefagedavuxitileti.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/taforap.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c40ad006c1ee92e6bbce0775f2576ca3/38046369603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=melhores+rpgs+de+turno+para+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_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 20804 bytes
SHA-256: 3557bba2aefa9ca6e248456410bbef8c8eb8b3dc927ce4f1be3ad3fea22f2101
font_01_sfnt_off000140a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 10764 bytes
SHA-256: 5b753410040b21c4db55288c48b7c38e59f8b78c6de8de3e7bab4cd1bbc7f40b
font_02_sfnt_off0001592d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1