Malicious PDF — malware analysis report

Static analysis result for SHA-256 681aee3aa4a5889e…

MALICIOUS

PDF

82.7 KB Created: 2021-04-17 04:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 214c2d6789609b6eb7d5a72e64015bfe SHA-1: 048188a4f0f80ffbdf374f1a58d79e47230529ed SHA-256: 681aee3aa4a5889e89e0059f74dce9643a77aff85c9c909f05b9cb5cdab6d2bd
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5914

Heuristics 4

  • 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
  • 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://druttle.ru/strik?utm_term=best+quotes+from+breakfast+at+tiffany%2527s+book PDF link annotation
    • http://axacheat4.xyz/biblia_de_estudio_vida_plena_gratis_para_descargar043lc.pdfIn PDF document text
    • http://rolazipomi.22web.org/77592619323.pdfIn PDF document text
    • http://filanion.online/what_are_canadas_major_bodies_of_waterkmti7.pdfIn PDF document text
    • http://biomanix.best/2013_subaru_impreza_2.0i_sport_premium_reviewjj45f.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/tubeluvixakop.pdfIn PDF document text
    • http://teaapple.space/mejogesixitodxqyp2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_5fd684545b688.pdfIn PDF document text
    • http://internet-babki.ru/7th_grade_mathematics_textbookl8y6w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5ff36f381d283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_791e7ace3ce74abea3039d07a1cdee63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/technical_analysis_of_the_financial_markets_by_john_murphy_amazon.pdfIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_125459ebc36e4b819d3006a2483d44d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/canon_t4i_price_in_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/tokixegiw.pdfIn PDF document text
    • http://gegokuberil.rf.gd/kutox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d06b25d-856e-4f5c-bb1f-dcaca30aeb50/rexisuwumiwabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d25711-7e6d-44dc-8c70-8c92ef74c65e/13790208548.pdfIn PDF document text
    • http://vivizegijarugip.epizy.com/160259288.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_5a22d4cb9d324478acaf6a1d0cc5106e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/7955012348.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_17c3f41be0ba4b85861610b0c157146f.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_945791e7e1e84ac7957b6cf500b20a86.pdf?index=trueIn PDF document text
    • http://vejusin.epizy.com/clinical_pharmacy_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/cardiovascular_system_anatomy_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d486a1a-c143-4374-b077-9340bd490c30/which_chainsaw_brand_is_the_best.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 5396 bytes
SHA-256: 01fdcbc7d83e76fbe029f537f3a903b46a57dd1772275b2357f610dc4bc767f5

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