Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a62831c33364e0e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 07:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e83c8c8cae61001230a714a39768456 SHA-1: eec541e49085433e3ab750557bc0e6fd09bef5a3 SHA-256: 3a62831c33364e0e112d490b86a41ebd657d1da05f1d4dca9b0503c15037b044
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one prominent URL suggesting a phishing or malware distribution attempt related to 'Aminoacidos azufrados'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://maypoin.ru/award?keyword=aminoacidos+azufrados+pdf
    • http://jemaluxelizadi.iblogger.org/beautiful_creatures_book_2_free_download_2shared.pdf
    • http://xabidewukolesas.66ghz.com/lung_collapse_radiology_report.pdf
    • http://pafekusiwajida.66ghz.com/brother_cs6000i_thread_bobbin.pdf
    • http://guromufupadaf.iblogger.org/worksheet_on_evaluating_algebraic_expressions.pdf
    • http://mifvideo.space/fortisandbox_configuration_guidem79vx.pdf
    • https://static.s123-cdn-static.com/uploads/4421612/normal_5ff9b682607f6.pdf
    • https://static.s123-cdn-static.com/uploads/4450896/normal_6001485cf1302.pdf
    • http://witabakukusutex.22web.org/laporan_pendahuluan_hernia_inguinalis_lateralis.pdf
    • http://fitokapss.xyz/stars_slots_free_chipsowqtq.pdf
    • http://lnstagramverifiedsbadgesforms.com/116043593t8aqd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ac1fd62f-4837-4186-ba42-b67bcd1ed155/what_is_the_gvwr_of_a_international_4900.pdf
    • http://zopimubusa.rf.gd/shelley_carson_tu_cerebro_creativo.pdf
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_0d7e0c4988ec4e4fb4048b9779c622cb.pdf?index=true
    • http://luwawabegopit.rf.gd/what_are_percy_jacksons_character_traits.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_ae9090d879d74659a555adab2d5ff6f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36b2102a-b159-484a-ad3e-20d96e4e76a6/96487133935.pdf
    • http://jiguluvosasibun.epizy.com/sarah_j_maas_assassins_blade_series_order.pdf
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_d85cd14b7c8a4572b7c4de587298fe5b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/677522a3-fe0e-480e-a280-0080d8a43bbe/dapubewojasuratasuj.pdf
    • http://rizinesuri.epizy.com/nixon_the_corporal.pdf
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_d64e6f7c55c34841b77045ec98232af6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0b2e1df2-12ae-45e7-9182-ce207a0fd7cd/i_am_legend_book_summary_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/d1d23d90-7a44-4543-adca-8f3c8cb3f7d0/how_do_i_find_deed_restrictions_on_a_property.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83c.bin
707e56adca87049d50f350a6206e67edd0f26fcffe12fed81a88a3ea5ed2e0ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 5308 bytes
font_01_sfnt_off0000fa3e.bin
40aec1f9d410adcc331609e140a0961ca616099435e252980a6b57b98d7b3b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 12016 bytes

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