Malicious PDF — malware analysis report

Static analysis result for SHA-256 de72418fe1848948…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 22:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d165844402cd42b8c35e76c18bb50a42 SHA-1: b58d4a3a9db6b2c6f1a4a293b391684a66c64dc8 SHA-256: de72418fe1848948268d649bf5d2db123f3e31c321de61cf96c6460fe7a15cd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/67461e8591837ce5be93a7507c795b70/bagulaxibibexofebinojokij.pdf In PDF document text
    • http://acevina.com/webroot/img/files/86585356629.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/gaxowovoleworagodakodu.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/94645244271.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/wuziju.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/66797665391.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/1331025162.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_1DDE2A617D8529A8.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/44009940069.pdfIn PDF document text
    • http://szwygs.com/upload/70375324796.pdfIn PDF document text
    • https://digireg.sk/upload/18255740350.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/68941664401.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/91543591063.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/kowakus.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/limedafibejijinanopa.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210909_B4330E23959BF0DE.pdfIn PDF document text
    • http://upakuika.com/img/file/gunusulisor.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/29319928537.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136790fdac02---tizerumuzawexiza.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/40510240206.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7801914100.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/8852060668.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/zeponisok.pdfIn PDF document text
    • https://mmtours.si/uploads/zepilunaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pc+games+free+download+appPDF 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 10860 bytes
SHA-256: fbf087b86b3d000091846e514bb1f293166ba801de04f88f8a765804bab1ea19
font_02_sfnt_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 17816 bytes
SHA-256: d86916f7fec59ab52bfe6e5df9a0c5115fc08d62267fbfec950a201652caf63c