Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71fa3dd75f2577d…

MALICIOUS

PDF

87.1 KB Created: 2021-06-12 13:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1d3c4d6f2013a905946f01740c66d9 SHA-1: d940202280c81430d6b7006ace98d0320e1254f7 SHA-256: e71fa3dd75f2577ddb1b0c5f26b2c4cd59dd46eb0e32720051a215ff2317f26a
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing attempt. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to obscure the malicious URL. The primary malicious URL identified is https://allytemp.ru/pbw?utm_term=m83+midnight+city+download+free+mp3, which is presented as a free MP3 download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/pbw?utm_term=m83+midnight+city+download+free+mp3
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/tixibujedurabig.pdf
    • https://cdn-cms.f-static.net/uploads/4385202/normal_60bf1397f3d4e.pdf
    • https://babuzusevajuwo.weebly.com/uploads/1/3/4/8/134878483/117711a1c30946.pdf
    • https://cdn-cms.f-static.net/uploads/4387218/normal_60331a7fafa56.pdf
    • https://cdn-cms.f-static.net/uploads/4423155/normal_606a5b61e4d27.pdf
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/kiwavatapak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e4301d4d-58a3-478e-9dcb-89f850907d27/vitejudujizesifegiremin.pdf
    • https://uploads.strikinglycdn.com/files/0faa4010-d4e3-4a32-abc8-1f37724ee3fb/metimetuvaresozenositimu.pdf
    • https://uploads.strikinglycdn.com/files/97b8fc02-89ff-4107-9b55-4cebceaca28e/8743113992.pdf
    • https://uploads.strikinglycdn.com/files/f9f43feb-3b2d-4e50-bfd5-7c0c55b5addd/jawasopimimivadakaxavigu.pdf
    • https://uploads.strikinglycdn.com/files/9dcb31ae-ddb5-4624-bf19-f5a35cfaf164/arduino_tutorial_youtube.pdf
    • https://uploads.strikinglycdn.com/files/37ec95a7-9e17-43ae-90fc-dc60c23d71ed/wagerod.pdf
    • http://mifimoruzuwo.pbworks.com/f/84199954532.pdf
    • https://uploads.strikinglycdn.com/files/85e3e11a-f803-4883-8257-446b773cf886/camilo_y_evaluna_boda_votos.pdf
    • https://uploads.strikinglycdn.com/files/d2211347-b554-436d-ab71-13b18579d914/kenmore_series_600_washer_lf_error_code.pdf
    • https://uploads.strikinglycdn.com/files/4fbc7b59-e69d-4e77-8c39-fd6a2ae70296/catching_killers_dna_profiling_worksheet_answers.pdf
    • http://xujefix.pbworks.com/w/file/fetch/144423432/pesukosavemariwogewoj.pdf
    • https://uploads.strikinglycdn.com/files/f0155b40-55de-46a0-822a-adec96482515/list_of_integrals_of_inverse_trigonometric_functions.pdf
    • https://uploads.strikinglycdn.com/files/615c1c50-db65-4133-9706-4f7e102e405c/lista_de_verbos_regulares_terminados_en_ar_er_ir.pdf
    • http://pusavivo.pbworks.com/w/file/fetch/144476247/tomulojidoxuzefel.pdf
    • https://uploads.strikinglycdn.com/files/9a4e103c-5140-42ab-afa2-64f513e9075e/apartman_gelir_gider_tablosu_rnei_excel_indir.pdf
    • https://uploads.strikinglycdn.com/files/de8d9dd9-0f6a-46df-a4b5-293e32bc48f7/romopokipabiturobeponu.pdf
    • https://uploads.strikinglycdn.com/files/18819524-e28c-4f93-948f-5e5ffde50f04/4515575011.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a0.bin
0c5b4e9652f485aa44e2b75148e67188a9acca2dd3be28e5c76ba9de96846ead
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 3048 bytes
font_01_sfnt_off0000f38d.bin
e6584ab808066e25312fcaf7350d282d47afd5ddf7221acb210d56a3b423301a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 5948 bytes
font_02_sfnt_off000107cd.bin
5f3200cfec4487897f10a8641de894c67fbadbdda0f56652b0f0605cee955338
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16796 bytes
font_03_sfnt_off000138e0.bin
18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 16144 bytes