Malicious PDF — malware analysis report

Static analysis result for SHA-256 844fa51bdf3d7251…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 21:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3549451677df5641420c18eecb09916 SHA-1: 53dde5f46ddc6b2583f3e5cab696170a38484c42 SHA-256: 844fa51bdf3d725101773ec9e959fe3a37f8a12fe5821babbc86f5ec484d8f59
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to host a collection of links for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://creaorganization.com/depo/sayfaresim/file/74980121044.pdf In PDF document text
    • http://ya-ke.cn/admin/upload/laguwekagef.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb2f708e4---vowutomurudabavobe.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/vawizegonubizumotiju.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/tabutigu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/64638976924.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/dugizuvu.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/dudavumimod.pdfIn PDF document text
    • http://www.77ice.com/upload/files/76604625533.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/72341531629.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/29220547453.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/vuvawejimabamijujoregufup.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/43966379715.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/nofonesobisinetudeva.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/85450309920.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/1128695953.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/rivujukukorijogedofiliroj.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109141449343982.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/sexisonimagimot.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/503pedlmp58934bg5hvk3f0c4n/gogib.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/82538482669.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/makupepedozuxagojuxunufu.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sipanote.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/75917472213.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/lijug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fast+food+restaurant+marketing+plan+sample+pdfPDF 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_off0000bec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC7 11008 bytes
SHA-256: f4d6e263ce5fbab20c16e94ce7622b7d1ed37d90be891463474fe05b40a0147b
font_01_sfnt_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 15840 bytes
SHA-256: 9e1347e045232c7c64e07a36de5810f215583d5eb4f5f50842e6e86dafa5a495