Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4be94944f068577…

MALICIOUS

PDF

75.8 KB Created: 2021-05-22 11:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 30ecbffa592861b717a09ef1a2e3e640 SHA-1: 2cd1ec0ee8efa872a8a1dc6b590f17ff9301211f SHA-256: e4be94944f0685778f155d625fe08c902f3f605f9dc1b2e8a339a5b2d7df5572
194 Risk Score

Malware Insights

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

The file is a PDF containing a link to a known malicious redirector, dafemum.ru. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the PDF might be a lure for a password-protected archive, a common tactic to bypass gateway scanning. Although no scripts were extracted, the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=elemento+de+la+tabla+periodica+que+tiene+mayor+radio+atomico In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/87789134806.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/allen_carr_quit_smoking_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd50923-4197-4764-8f72-40dd00c7e9fd/zutomugorabaxugigo.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/bloquer_appel_inconnu_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/natural_gas_inventory_report_release_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99709e13-823a-4de2-90d8-ad0365af2b6f/96559595109.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/dmv_nj_test_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95410e07-85fe-4df8-abd4-318bdc36216d/page_break_in_google_docs_on_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/perth_tv_guide_wa_au.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c806856d-e191-4511-898f-e52b4741e4f1/lujobekedavigalexufub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/354964db-0758-4860-9c77-b60dc7f17963/leave_sell_back_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/free_music_to_imac_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/is_lucid_dreaming_good_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f584243d-9a67-4dc2-bde1-9a670c3a5456/14837325525.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/etrian_odyssey_5_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/jatijuvigivaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/comfortably_numb_guitar_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/modelo_memorandum_de_llamada_de_atencion_por_incumplimiento_de_trabajo.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/bepevizeniranezasifigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bd1739-6186-4442-91ce-b4878547a0a4/wireless_n_repeater_not_connecting_to_router.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/tekipojisegabipivime.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_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 5368 bytes
SHA-256: 50d9740a29c369402ccfab4f01e6f79c23087c180728132dd7413e7dd074bb44
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 11244 bytes
SHA-256: d7e5508ad177c989b04d1ff44c45bc18d0603e327590a1a4693d9bb899d5a4a7

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