Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09942a29575672b…

MALICIOUS

PDF

87.3 KB Created: 2021-04-16 16:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 30b095927f61834fbf3cea70a42fc8b5 SHA-1: 67fcd37e68ad02014065dc39d4130c465e61652c SHA-256: d09942a29575672b245b8f74bcbfeeab02885d2f4d08a2d59a1ee671d3605db7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/strik?utm_term=international+business+major+grad+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_6044fe93a4d08.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuruzu/aF4thhJ/79295944772.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/ificzge/9321707133.pdfIn PDF document text
    • http://itsnat.space/musonujetukadilaxofuluwornhzuu.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://jafinipu.scienceontheweb.net/42594218479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_605f3d349761e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_6031ed7a5a310.pdfIn PDF document text
    • https://cdn.sqhk.co/woxezelej/XsMUicX/deity_fallen_facebook.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/internal_audit_manager_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/Lih2jcd/18332704734.pdfIn PDF document text
    • http://eslivdrug.space/oracle_sql_queries_interview_questions_and_answers_for_3_years_experienceobsbb.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/jeBBifN/buwuzufixanasupivimifino.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/xisawavilimoxogobusep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ximupuv/realtek_hd_audio_manager_not_in_control_panel_windows_10.pdfIn PDF document text
    • http://xedavabawavela.onlinewebshop.net/49528453059.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/farmhouse_tv_stand_65_inch_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/levufoduxalidewonimirawow.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/xugojaxomediniwenumixe.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/best_marine_weather_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/character_sketch_of_johnny_in_the_ransom_of_red_chief.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 5388 bytes
SHA-256: e96d27cd221e028a9d64f5a071792b8df27be0e9acf2884e08c472042baad78d
font_01_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 11764 bytes
SHA-256: 473e1840ba986543ce63fc6acb2585da2fed91e2da1f16842f0e8ed2f20c2e52
font_02_sfnt_off0001411b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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