Malicious PDF — malware analysis report

Static analysis result for SHA-256 86761a012c54398b…

MALICIOUS

PDF

73.5 KB Created: 2021-02-01 21:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9b3174e8e398ad8a8053c7f896dfd1ac SHA-1: 0b296b87787a3ba5153b94f99005d4a7eb8e7a36 SHA-256: 86761a012c54398b9f130ca1d9895684c25a5176274e40e9b5f8a89cfd621496
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://crophysi.ru/aws?utm_term=bickerstaff+neurology+book+pdf+free`. This suggests the document's primary purpose is to trick users into visiting a malicious site, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

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://crophysi.ru/aws?utm_term=bickerstaff+neurology+book+pdf+free In PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/oVOr0jf/bogopigafodenaberuni.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/gthhZqo/dreamline_prime_shower_door_installation_video.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/blhi2zV/466283414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fd09d724ba81.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/jgd2Gf5/download_game_tegra_crafting_and_building.pdfIn PDF document text
    • http://talebakela.iblogger.org/demonstrative_pronouns_worksheet_3rd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/hXjahzN/31457789195.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/gjhjegi/the_best_screen_recorder_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/jfDShez/don_t_touch_my_phone_pictures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/polexebuj/deadpool_1_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/corporate_governance_report_format_mauritius.pdfIn PDF document text
    • http://tamedigozetot.epizy.com/gigebotiberiwas.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/us_citizenship_test_questions_and_answers.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 5680 bytes
SHA-256: 88e784869ed249fc8505ed52ae978a1d9136ebd10641a8c3ef257ab151d498ae
font_02_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 10992 bytes
SHA-256: f6b679d9f4c2085874599b58c7b904478aed3323ab1c0a850918d264de5eb521
font_03_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa

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