Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e6938810a64f5a…

MALICIOUS

PDF

80.2 KB Created: 2021-04-01 08:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a68e2d6ccd5d95c6727d0cd82f0f948 SHA-1: 50c969d20b80c98da8a7a08b0fee2cffad254729 SHA-256: a3e6938810a64f5a376de4816a176fc6469952c07fe8290b34cce85aaa3d9551
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with one prominent link leading to a suspicious domain that appears to be part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=infinix+note+3+battery+price+in+kenya
    • http://xoziduso.mypressonline.com/66661469951.pdf
    • http://morikulifitoj.22web.org/algebraic_expression_6th_grade.pdf
    • http://rekabiw.22web.org/avengers_2018_full_movie_tamilrockers.pdf
    • http://lozajakar.iblogger.org/nidoxinojavimemogenagewes.pdf
    • http://bexemusu.mypressonline.com/23283694788.pdf
    • http://bixaxivajujojar.mypressonline.com/autobuses_jimenez_horarios.pdf
    • http://zisuroto.mygamesonline.org/atomic_habit_tracker.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafijukopa/origami_heart_box_instructions_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/9f9ed53a-ddb9-46d7-9f6c-1448cd4f8cb0/how_to_turn_on_a_bosch_dishwasher.pdf
    • https://uploads.strikinglycdn.com/files/3ae14f4f-1107-4b21-91ad-e38f33ee0594/papitikojel.pdf
    • http://daxotumolurotaw.rf.gd/the_shining_tv_mini_series_cast.pdf
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_c52fb0aec95b476d9c3d024aa2770200.pdf?index=true
    • https://s3.amazonaws.com/figidireki/babasobax.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/ar_rahman_tamil_songs_free_2015.pdf
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_f31da47f0027417e95e98c55b1cd5947.pdf?index=true
    • https://s3.amazonaws.com/zemunomipazikez/namakam_chamakam_naa_songs.pdf
    • https://s3.amazonaws.com/gofilafixu/what_are_the_daily_responsibilities_of_a_medical_laboratory_technician.pdf
    • http://kalilom.epizy.com/access_control_security_and_trust_a_logical_approach.pdf
    • https://uploads.strikinglycdn.com/files/d6499eee-fffd-4c81-a8fd-a8c437ea4107/can_you_get_a_good_lift_at_planet_fitness.pdf
    • https://uploads.strikinglycdn.com/files/c7d93655-4009-4c50-8aa7-5ec20f34af11/salario_de_agente_da_policia_federal_portal_transparencia.pdf
    • https://s3.amazonaws.com/xunilukegez/15637563339.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_off0000e691.bin
2192cf5f40447b8f0eb18951ef17ceb14bdf8b5b0a6c97aed594af4dab13bc49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5276 bytes
font_01_sfnt_off0000f8a7.bin
be026ce3d1b25bff380b8be674ce904a0d813d99feb8dec66d0af722cbebbd5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11128 bytes
font_02_sfnt_off00011e36.bin
b7c2c19f3c3fbccd496c35cb4f1738504b26c643661edecdbc84ce1c14e933a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16120 bytes

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