Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88787d01416192b…

MALICIOUS

PDF

86.0 KB Created: 2021-06-04 10:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae85c5ca766fe02d63632174feba2b57 SHA-1: 252cbe826c151881ef6ddb3026bfe055a8fd6aa1 SHA-256: d88787d01416192b078a0df04d65e7bf6466407606526e708149ea1b2ec711c2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms used to boost search engine rankings or distribute malicious content. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to applicant guides, further supporting a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/123?utm_term=pct+applicant%2527+s+guide+annex+d
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/4fb0d4f2bba4e43.pdf
    • https://bitoxusimafitaj.weebly.com/uploads/1/3/4/3/134311342/jedunonu-nedaxezisa-bazowavujilu-vokuzoluxo.pdf
    • https://garigokowexe.weebly.com/uploads/1/3/4/4/134440629/teweji-jegufananu-tejavawal-zafam.pdf
    • https://static.s123-cdn-static.com/uploads/4421937/normal_5feccea842ea4.pdf
    • https://cdn-cms.f-static.net/uploads/4377100/normal_605a70e84630b.pdf
    • https://static.s123-cdn-static.com/uploads/4477373/normal_5ff55861a8067.pdf
    • https://cdn-cms.f-static.net/uploads/4453914/normal_6068d496500ef.pdf
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5fed684850aa7.pdf
    • https://sowofodifidem.weebly.com/uploads/1/3/1/8/131856479/ruxaf-namidimak-vesidisorafikej-valekekila.pdf
    • https://static.s123-cdn-static.com/uploads/4467564/normal_6001703840003.pdf
    • https://cdn-cms.f-static.net/uploads/4493578/normal_603679b287454.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42f9e64b-95a0-449e-b392-dbbb87bc8c7e/porque_funes_el_memorioso_es_un_cuento_fantastico.pdf
    • https://uploads.strikinglycdn.com/files/b83b5c7c-65b8-4fe3-b5e2-db068671dc50/guitar_songs_tabs_and_chords_app.pdf
    • https://uploads.strikinglycdn.com/files/4d864ea3-e5cc-4218-a554-17dc92cb88cc/bissell_cleanview_vacuum_cleaner_reviews.pdf
    • http://ridelox.pbworks.com/w/file/fetch/144468477/2.3_calculo_de_integrales_indefinidas_ejercicios_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/2de985bc-3834-41d0-b37a-6031a7c11e0a/introduction_to_real_analysis_william_f._trench_solutions.pdf
    • https://uploads.strikinglycdn.com/files/b86d3640-3321-4b96-be6a-6fe9abff4084/lekowifegapibibuwosetebup.pdf
    • https://uploads.strikinglycdn.com/files/d8fd87e4-32ea-4f63-a686-bc1dbfae4019/2013_subaru_impreza_hatchback_rear_spoiler.pdf
    • https://uploads.strikinglycdn.com/files/18cd90be-d10a-4946-a6b5-53ab68ff8438/classics_of_philosophy_3rd_edition.pdf
    • http://jetipufagi.pbworks.com/f/guviwog.pdf
    • https://uploads.strikinglycdn.com/files/50db134e-ce08-470d-8102-0ddc26ada927/you_are_good_and_your_mercy_is_forever_hallelujah_tye_tribbett_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/8c3989eb-2664-48d2-bf3a-9b12c66282e2/saxon_math_intermediate_3_written_practice_workbook.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_off0000fb36.bin
c4f9a4b0a3c69bb17da27782b537b0ecac308717b63a7b99079f29c40f9f5ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 7244 bytes
font_01_sfnt_off000113b1.bin
1cb7197ef5fc8ed53c51abfe19474873792d3c5475a55a2f94db44a39d604d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 5248 bytes
font_02_sfnt_off000125aa.bin
db4a9f1428c81f7af3e51530c390e4d59dad6ee2c53ba54c3d58ff0bbc1cc714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 10244 bytes

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