Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fb5fa8ece4e66c…

MALICIOUS

PDF

84.4 KB Created: 2021-03-24 15:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0129b4c1c09a16306c5793a3312033f4 SHA-1: b6a4566e25cff89a450917d403b3e67e9ad00dbd SHA-256: 76fb5fa8ece4e66cc264dd16e9507c98bbe64f5876e0b161ad2db534ed1c95fd
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating an embedded external URI. The document body, though heavily obfuscated, contains text related to 'Miller analogies practice test pdf', suggesting a lure. The primary IOC is the external URL found within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://dafemum.ru/award?keyword=miller+analogies+practice+test+pdf
    • http://clubstore.pro/davis_drug_guide_online_discount_code1sv46.pdf
    • https://cdn.sqhk.co/degavorofala/jxiiii4/wheely_4_time_travel_level_14.pdf
    • http://wazepewazivulil.mywebcommunity.org/2355682195.pdf
    • https://cdn.sqhk.co/voduzetefir/iVidgjO/heart_touching_teachers_day_quotes_in_malayalam.pdf
    • http://shimano-stradic.ru/how_long_do_i_cook_ribs_in_a_pressure_cookerbkjtb.pdf
    • https://cdn.sqhk.co/mazonixun/eYhhWDf/honda_accord_2015_manual.pdf
    • https://cdn.sqhk.co/zepipawetopi/THib6hg/moeshouse_wifi_smart_switch_garage_door_controller.pdf
    • https://cdn.sqhk.co/tukawezezo/hcjjXjj/widemufumulimomigigefodas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/67340e0a-cb30-426e-aabb-577965bc721e/16264811696.pdf
    • https://s3.amazonaws.com/lebaxa/84644055873.pdf
    • https://s3.amazonaws.com/lomuper/7353003787.pdf
    • https://s3.amazonaws.com/fasomusogapovi/scientific_method_practice_problems_worksheet_answer_key.pdf
    • http://bupalim.atwebpages.com/oxford_dictionary_of_sociology_free_download.pdf
    • http://pekamidakoj.atwebpages.com/abnormal_psychology_case_studies.pdf
    • https://s3.amazonaws.com/dugibabafod/xupowimobupi.pdf
    • http://nununad.myartsonline.com/67449435437.pdf
    • https://uploads.strikinglycdn.com/files/14b73ff0-e1c5-4a62-8b7a-f98728b29c10/96111399938.pdf
    • https://uploads.strikinglycdn.com/files/e4c1a31f-6077-4406-af93-5c0c19e4daef/char_broil_9000_series_grill_parts.pdf
    • https://uploads.strikinglycdn.com/files/ad755436-ee32-489e-9443-f4cb61487ffa/rinnai_code_12_problems.pdf
    • https://uploads.strikinglycdn.com/files/38761e9f-0e70-4cf2-88e3-9efa26a4bb5e/how_to_solve_missing_number_problems_ks2.pdf
    • https://uploads.strikinglycdn.com/files/5c4f3ab7-10f3-467d-9035-59b7cfe3c610/iso_9001_preventive_maintenance_requirements.pdf
    • https://uploads.strikinglycdn.com/files/c3cb8819-6ca2-4ed9-a5dc-6ab684843c26/how_do_you_open_a_graco_double_stroller.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc09.bin
675b640f9861b1f141016f75883e025eff8b88bfee3b93b27f066c2f02bfa9ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 5116 bytes
font_01_sfnt_off00010d7c.bin
a34f3c9d8d5993019d8686b91b4742683eeb60b4564fe8fa00e288ff94217bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 12048 bytes
font_02_sfnt_off00013559.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 4324 bytes

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