Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b92dfe24faada5…

MALICIOUS

PDF

71.4 KB Created: 2021-03-10 10:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3f7e527bf4d91e5da44ff6f96cf8776e SHA-1: 617ae33312a9da663282662768cce0476ada9381 SHA-256: a7b92dfe24faada56cf4648d1aa63407e93d62a02205f0012590ba12fcd05758
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with at least one pointing to a suspicious domain ('zajinet.ru') that is likely part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

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://zajinet.ru/award?keyword=bsc+magazine+may+2020+free+pdf PDF link annotation
    • https://ligunetanojuwid.weebly.com/uploads/1/3/4/6/134625742/11c1a40254f579.pdfIn PDF document text
    • https://gulegeletemewux.weebly.com/uploads/1/3/0/7/130738758/furokexuxu-lomizedipe.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/abCYjiz/3d_home_design_online_easy_to_use.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/how_to_change_language_on_sandisk_clip_sport_mp3_player.pdfIn PDF document text
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/kesovukurulapag-rawurupuxibega-bizubejadaba-jamifeji.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/gfhejey/gapinew.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/vonimutelil.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/farivoloku.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/30350484943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/google_play_services_apk_for_kitkat.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_922fb280db4c48aa877d3911fb5c7aa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/47514525396.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/narration_exercises_for_class_10_with_answers.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_0888a6795ad74d1e910c071ea594970e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/troy_bilt_bronco_riding_mower_mulching_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/brule_river_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/solving_quadratic_equations_by_graphing_activity.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_2e90cd76075f4126ba37f1da03750cf2.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 5916 bytes
SHA-256: e81e6c7713615c8df857e3c1c307b234f457775222d084035f2f316beca4f932
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 9936 bytes
SHA-256: 7e8998528af43bb7055a59b7dbfc9ce93e3779c68b651fbe5448376cf6702f48

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