Malicious PDF — malware analysis report

Static analysis result for SHA-256 813df5ea18f45b4e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-08 05:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 688d717bf2860fc7446d7a031cc1d846 SHA-1: 1bf6fafea09f2daecd6063e9f448ee75f926fb3c SHA-256: 813df5ea18f45b4e8b67265b832fc13fa2c2e2f37e3028b82809444221f9e5d3
154 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a known malicious redirector, 'dafemum.ru', which is likely used to deliver a secondary payload or phish for credentials. The PDF structure itself does not contain executable scripts, but the presence of the malicious URL and the high confidence threat detection indicate a clear intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/wix?keyword=serial+killer+enneagram+types In PDF document text
    • https://wabuxopimigom.weebly.com/uploads/1/3/4/0/134042903/nejoramafa.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/29fe128b2.pdfIn PDF document text
    • https://riwipawubo.weebly.com/uploads/1/3/1/4/131453561/sufovirutose_fodagemur_jebazixevolute_memoxak.pdfIn PDF document text
    • https://wedodoto.weebly.com/uploads/1/3/5/9/135993452/jopakugu_javogukarenux_zugamujawogov.pdfIn PDF document text
    • http://fowevuwakit.22web.org/can_i_use_my_phone_as_a_hotspot_att.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jugixumob.rf.gd/baidu_wifi_hotspot_para_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3be3485-2203-444d-b5b5-9adc0e141b39/sharp_carousel_convection_microwave_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/bad_romance_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/maserati_granturismo_convertible_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc51aec-7159-4b06-9dac-6792745f5668/rawisisodovu.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/2019_and_2020_monthly_calendar_template.pdfIn PDF document text
    • http://defiretojeven.rf.gd/garmin_vivofit_4_vs_fitbit_charge_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f428c96-6143-4bec-ab1b-b73899b78054/voxodulelifire.pdfIn PDF document text
    • http://suxuzodezojoni.epizy.com/eoc_practice_test_algebra_1_florida.pdfIn PDF document text
    • http://kitojob.epizy.com/jarozowalojirosajupuwav.pdfIn PDF document text
    • http://fututajadijet.epizy.com/masezetusiliberodove.pdfIn PDF document text
    • http://buripire.rf.gd/neuropsychological_assessment_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c89fac0-c3f5-4d8f-87eb-42ae2d96d720/lotus_sutra_chant.pdfIn PDF document text
    • http://gizafetagox.epizy.com/jonivonenabojajulipar.pdfIn PDF document text
    • http://getozareburi.rf.gd/midiwawevavesu.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/how_to_read_poem.pdfIn PDF document text
    • http://gojupugifoliru.epizy.com/vuxelivulubegoveled.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 5408 bytes
SHA-256: 97487b5b9499be11d8a4929ae777cd71c9958ab66ce4fa6d369e1e33740f2575
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10880 bytes
SHA-256: 2386c55e75d0e2ea3a092b3203eac656daa737e26761087b3ef268e9f04d3d3c

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