Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecde0b6ade177c97…

MALICIOUS

PDF

73.1 KB Created: 2021-09-29 04:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d3fdcbbb4231192cc9bf56d1fa675e4 SHA-1: b7fb223d81854929649cc21255f93ceba2468ed8 SHA-256: ecde0b6ade177c976f338ce466471df81694ab27aed0889f61674a9c2420121b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs, many of which point to disposable domains and are structured as a link farm, indicating a likely attempt to redirect users to malicious content or phishing sites. The presence of many unknown reputation URLs suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://nirmalapublicschoolerumely.com/userfiles/file/xinedavutapolonuxone.pdf In PDF document text
    • http://geoodwierty.pl/files/file/90176351239.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sunumujitus.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/puwiluzoguletoketuxu.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/savibewakawijuzetusojed.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///43273517477.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/297045196.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/5242504436.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/fopugisegajevifulanebima.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/57955729217.pdfIn PDF document text
    • http://pvvc.cz/files/85900259152.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/81795581269.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/48103852300.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/30143396577.pdfIn PDF document text
    • https://people11people.com/uploads/File/11421561942.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/20503596030.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137d2ed1162a---gigitarapadinojo.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/ganixovakijepexademivevo.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/mapefikoroduvigizuwiza.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/galewenibok.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/66817597188.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d5431e1294d4e9cf7481135bae04ef1e/6105285324.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/vurizigoz.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jifefifubaluwolofanisi.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/konojubipumumorutoxemab.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/vilesiwizipinimatafizol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nonton+a+quiet+place+iiPDF 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_off0000b97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97B 18092 bytes
SHA-256: d6a8bc1b549b2ee3ed91ee6ae793e3e31a043353c874d76fde8c2cab60f6c972
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 10324 bytes
SHA-256: 7724389a60bf7bac0643f20bf5cda77122884f6da4be88f7cc6fcb653278e2f8