Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff71355d173bf4bd…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 07:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ea59cd725c840aa67fbfd497dfdc9fd SHA-1: 562ec00360ff6e5c01f9391d0105b3696fde93d5 SHA-256: ff71355d173bf4bd1c71bd9f08e96b70781723f0dabcf873ace3aaf9762f95be
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=young+goodman+brown+study+questions+answers
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/5481486.pdf
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/nofot-mapurasobaga-jizenesanave-jubumazapal.pdf
    • https://lopepuru.weebly.com/uploads/1/3/4/3/134320072/fubibibobonuriboveti.pdf
    • https://cdn.sqhk.co/kixobaza/hagjdqo/pse_archery_black_friday.pdf
    • https://cdn-cms.f-static.net/uploads/4418178/normal_603a50c61c6d9.pdf
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/lugojutamomev.pdf
    • https://static.s123-cdn-static.com/uploads/4469135/normal_5feb8824d852d.pdf
    • http://jewivodapujoje.iblogger.org/certified_mail_form_3811_instructions.pdf
    • https://cdn.sqhk.co/lumozupa/RDj1P5Y/download_ultimate_robot_fighting_mod_apk_rexdl.pdf
    • https://cdn.sqhk.co/xejoxoka/iehcjgj/grow_kingdom_mod_apk_revdl.pdf
    • https://cdn-cms.f-static.net/uploads/4457572/normal_60100420e0006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/45f3310b-0566-4499-9bab-85d879813d1f/minuduv.pdf
    • https://uploads.strikinglycdn.com/files/db861235-36c8-40ec-ab23-3c608d223f5a/juvojofadupujemanozenuwit.pdf
    • https://s3.amazonaws.com/jugobimuraje/bcbs_mn_medication_prior_auth_form.pdf
    • http://viminug.epizy.com/anne_of_green_gables_movie_2016.pdf
    • http://kosuvoz.epizy.com/zupabunuwi.pdf
    • http://tidaxapotemi.rf.gd/webeneduw.pdf
    • https://s3.amazonaws.com/mesixadelomomo/94032163206.pdf
    • https://s3.amazonaws.com/xamibudasagas/92361247126.pdf
    • http://vizawog.epizy.com/mejiso.pdf
    • https://s3.amazonaws.com/fedojigudaj/handwriting_without_tears_worksheets_free_printable.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b3.bin
8c27691dad6e75a7055dde503748cbb5bd17df906d35d4be161baae0a6bafa68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5536 bytes
font_01_sfnt_off0000fc83.bin
15cb15c433f686f0f1808b1ec41bea5fa5742da8356703e68405587b0d749dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10620 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.