Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b51cd23a76d8b48…

MALICIOUS

PDF

74.8 KB Created: 2021-03-01 12:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1cd107842311a98cc6433a467320a86f SHA-1: b0bd0fba55c571f72b1b4139223b6911acb7cfbb SHA-256: 1b51cd23a76d8b48dad1962af9c9025e8f12de1f607bd3dd12c7168f001f608b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=online+bible+study+groups+kjv PDF link annotation
    • http://poxumanavofeboz.scienceontheweb.net/syma_s107_s107g_rc_helicopter_charging_instructions.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/kobazodekapolaseldtifv.pdfIn PDF document text
    • http://probmake12.xyz/pc_bluetooth_dongle_software_free3zx9e.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/nagutovidurezuxe.pdfIn PDF document text
    • http://vkrowl.com/class_11_math_book_bangladeshwym6t.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/vukuto.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/5dWiazm/manor_matters_pc_download.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/cheap_healthy_bulking_diet_plan.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/94341041675.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/ieQjgKy/bird_screaming_outside_at_night.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/what_does_wearing_an_ankle_bracelet_mean.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/cuantos_elementos_de_la_tabla_periodica_son_gaseosos_y_cuantos_liquidos_a_20c.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/honeywell_home_rth221b1021_e1_rth221b1021_programmable_thermostat_off_white.pdfIn PDF document text
    • http://csxmoney.info/71390984658mddkp.pdfIn PDF document text
    • http://marinarus.space/515049199718jkwk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipebevu.atwebpages.com/que_es_un_dispositivo_de_salida_de_datos.pdfIn PDF document text
    • http://nasakitubaribud.rf.gd/chupke_chupke_movie.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/timex_ironman_gps_battery_life.pdfIn PDF document text
    • http://sojopisosifa.epizy.com/kewunagezutawemil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 5384 bytes
SHA-256: 2facc1d0037f10fdfa605e92fd3acac8ffe0a100eb8599f7f74cb98c0f77c7ae
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 10316 bytes
SHA-256: d98c544a3ca91a669cdd143d81b24c2af1f4049b5d1cecc4f5858ccc56d554cd