Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e21489d5c168b2e…

MALICIOUS

PDF

69.0 KB Created: 2021-04-03 11:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e8601b539df0475db0acdd62d2428443 SHA-1: 8c5e36f7117de408e1fc20fe54689aae06c17556 SHA-256: 9e21489d5c168b2e7d22ccfce382c985a69f6627a063ed8a2a52f501731b3e4c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, dafemum.ru, which is disguised as a guide. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of a malicious URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/123?utm_term=endless+frontier+hogwarts+pet+guide In PDF document text
    • http://zitugaxusi.mygamesonline.org/sharp_portable_air_conditioner_window_adapter_kit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fe35ca7b4d56.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/83391383976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_6029644ed4f26.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/selena_movie_questions_answers.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/pt6a-11_overhaul_cost.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/46996b06-2923-412f-a79a-1ef27d6e855e/31513447146.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/nhs_self_certification_sick_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/free_piano_sheet_music_for_queen_somebody_to_love.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/6674182492.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/lijiwutezegemenawimid.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/gotaboxot.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/code_language_for_android_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92bd71f-5d26-496e-8802-0b244cd50823/best_feats_for_druid_pathfinder.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/22129133199.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/newspaper_report_example_ks2_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/paper_cutting_machine_32_inch_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/kodomixofadusagapoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/surah_mulk_transliteration_my_islam.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/96394290430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0206d927-b894-4adf-a613-526e0c27b0ec/06_honda_odyssey_oil_type.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 5352 bytes
SHA-256: 9294ba9e3e432fe1c490148a621451458ff40723a16bea21ed6249efebe5b1bb
font_01_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 10436 bytes
SHA-256: 72a9e0281081a08e47e46e883174c95c78f64610d3bc5490f46942ba0848b854

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