Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bac21dfebdbd6d1…

MALICIOUS

PDF

72.1 KB Created: 2021-03-31 01:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 37bf6adb5259fb92ad7538da76ecb3cf SHA-1: f2fccaeceea486ab55594caa01ef4507f6c72776 SHA-256: 9bac21dfebdbd6d15d73fd001d281778b07b5ea25fb371d36acd20148c0eadec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with a primary suspicious URL being 'https://soxebez.ru/strik?utm_term=nintendo+ds+lite+games+minecraft', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains keywords related to search terms, suggesting a lure to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=nintendo+ds+lite+games+minecraft PDF link annotation
    • http://olymptrade.buzz/lydia_davis_short_story_break_it_downltxio.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/python_for_everyone_2nd_edition_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6021bc5179bd2.pdfIn PDF document text
    • http://zelupelar.iblogger.org/nolofag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_602a45024efbd.pdfIn PDF document text
    • http://probmake12.xyz/presentation_materials_effective_c_in_an_embedded_environment192ni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fef351ec366d.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/famanozujirexemen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c912ee4e-0480-494b-aec4-022863d80301/sig_sauer_p320_vs_glock_19_en_espaol.pdfIn PDF document text
    • http://texotozaxaw.rf.gd/present_perfect_still_already_yet_exercises.pdfIn PDF document text
    • http://nasujaguza.epizy.com/assessment_and_evaluation_in_education.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/best_biceps_workout.pdfIn PDF document text
    • http://sibaxelori.epizy.com/rizenejukasiwibitarab.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_4c233467b9b343ee8c7f972cf282ec36.pdf?index=trueIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_c33213d124f44b28b502fad46105b85a.pdf?index=trueIn PDF document text
    • http://zenujasope.epizy.com/zoxidofiwudesagibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d15ff2-f110-47d8-a01d-254b1471349a/shashi_tharoor_inglorious_empire_audiobook.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D9 5308 bytes
SHA-256: 4d56e442610b1398f738686c63bfd8f2311b7f959cfb1f93955ff89f7e55509d
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 10512 bytes
SHA-256: 0819d35fbc566bd54e3fd7fc076361ffee3e2b67f41579801c4693e6a4d72096
font_02_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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