Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51a2aa1446567a6…

MALICIOUS

PDF

151.8 KB Created: 2021-03-12 06:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 111934b51aa9eb5222eb357eee968b7d SHA-1: 7dfc43e6556eeadd917fcb4033b6d4db805e1d27 SHA-256: e51a2aa1446567a6ab71385d675f75b322666adbe668a28c2c36ad405a8fc624
162 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/123?utm_term=bahubali+2+boy+video'. The document body, though heavily obfuscated, contains text suggesting urgency ('account will be terminated', 'action required within 24 hours'), aligning with phishing lures. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', further confirming its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=bahubali+2+boy+video In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_604648747d9a7.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/is_there_a_sequel_to_the_dark_tower.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/mebuleduxemokuvafol.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/learn_to_draw_books_for_5_year_old.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/xelisotuzugejigefo.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/5029496.pdfIn PDF document text
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/b60268ec19ecb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6040f4b4d33b0.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/logic_pro_x_manual.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/conditional_statements_worksheets.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/zesizusus.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/73ce359b-09af-43cf-a6ea-586693f26535/1448037654.pdfIn PDF document text
    • http://xasagode.myartsonline.com/the_vegetarian_epicure_anna_thomas.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/beep_sound_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/different_honk_jr_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd231d20-c566-4e4d-8c79-80643cd9ea3a/att_velocity_2_mobile_hotspot_zte_mf985.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/linek.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/2007_club_cart_lift_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3d83ec-3808-46b9-b462-ac27cdd4b88f/lippincott_biochemistry_reddit.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/99832802523.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D170 13324 bytes
SHA-256: 3882fe868c7f8e522742eb5dd6eb3391dc5c9c7283002a621a9ac91e44231e97
font_01_sfnt_off0001fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD25 5124 bytes
SHA-256: 43a98e85ddbb0cb333012da133ebbd635b40ff6d308f4735680f902c6dbaf658
font_02_sfnt_off00020e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E9C 13232 bytes
SHA-256: 04c2b4d7c62e5ed72a1d3cd85562fbda9a067b38687c7479686dbc1167d1bcc2
font_03_sfnt_off00023aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AEE 16416 bytes
SHA-256: 8202b61d4f9ab5b7a015f7d10caf75a2375c7bc6ddfe54605fcb06c91ca27e57

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