Malicious PDF — malware analysis report

Static analysis result for SHA-256 436d2f70f8a806ae…

MALICIOUS

PDF

76.4 KB Created: 2021-04-11 06:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8b6d9365a642ea6f505a199e69bf05 SHA-1: 1648229f68b45202fea8e250bf17659ee41fd6e4 SHA-256: 436d2f70f8a806ae32b74f7a1faffe182860cbd8af6b74247871b4f8f14bf43a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. One prominent URL, 'https://xezojetit.ru/strik?utm_term=sindh+text+book+mathematics+for+class+6+pdf', is directly associated with the document's apparent purpose of luring users with educational material search terms. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xezojetit.ru/strik?utm_term=sindh+text+book+mathematics+for+class+6+pdf
    • http://rexuwoxaga.sportsontheweb.net/snap_roadshow_presentation.pdf
    • http://niwopofe.scienceontheweb.net/possessive_pronouns_lesson_plan.pdf
    • http://jetinaxisodew.mypressonline.com/booster_pump_grundfos.pdf
    • http://bumasujofoj.getenjoyment.net/tokyo_ghoul_chapter_139_discussion.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xumakomowi/pentair_easytouch_control_system_indoor_control_panel.pdf
    • https://uploads.strikinglycdn.com/files/52e50611-f820-4022-911c-6ddf25e642ab/are_armitron_watches_reliable.pdf
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_f82c5840bfa34f7bbfa8e55a006fe264.pdf?index=true
    • https://s3.amazonaws.com/rorives/coast_guard_regulations_for_boats.pdf
    • https://s3.amazonaws.com/sixenogafopoj/microsoft_word_label_maker_template.pdf
    • https://uploads.strikinglycdn.com/files/ceec8cdf-b3a2-45f7-86e0-a26c5260614f/66191645703.pdf
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_dedcd14e93d4454288c26676ab080329.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f50ba109-d2d3-49ee-b7b7-bddf8c51d42a/dark_souls_bosses_rated.pdf
    • https://s3.amazonaws.com/xovajukoxin/talisujaj.pdf
    • https://s3.amazonaws.com/toguvaju/rem_its_the_end_of_the_world_lyrics_chords.pdf
    • https://9b2ef95a-2922-47a0-9c22-e01f3107c538.filesusr.com/ugd/c345b0_2b549933026e41398f0f65de33da8ba8.pdf?index=true
    • https://s3.amazonaws.com/regovadeje/rejexufewezatutik.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_e91dd6f0e3e04212b232d92dfc9cab19.pdf?index=true
    • https://s3.amazonaws.com/woxewiwupir/3rd_grade_cursive_handwriting_practice_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/58161b38-b854-438b-9af9-20295463c2a3/hp_photosmart_5510_printer_problems.pdf
    • https://s3.amazonaws.com/wupixufekijax/mubamagimikobiwojikum.pdf
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_be6b44278c9b497180c5ca391ee50b4a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8406b7fc-dd56-4d6f-9720-404f56080df5/luzivu.pdf
    • http://saboveliga.myartsonline.com/butad.pdf
    • https://uploads.strikinglycdn.com/files/304cdb45-1232-426a-8574-f422ea8ae07d/67748667023.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d4.bin
e16b8d9b6686c99f00057498861e4755f580b2b44ca4a435396b2b7c60f0696b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 5924 bytes
font_01_sfnt_off0000ebd3.bin
0fe557ea96bb6c4f925a5520d12f3aad628b07b1e2b7da68b5c43d03c0be30eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10008 bytes
font_02_sfnt_off00010e4e.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 16204 bytes

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