Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91e3b7b635b5ad7…

MALICIOUS

PDF

88.3 KB Created: 2021-03-19 08:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b2f89be80052eab9cfb2108c00f13fe1 SHA-1: a4e75080db0c4904b36cc4e40ed35732e9a70edd SHA-256: a91e3b7b635b5ad76e1d341f192d3b9a63efb47bd2870d5b44a8428388384f36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm heuristic further supports the conclusion that this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=gastrointestinal+stromal+tumor+gist+pdf PDF link annotation
    • http://gudegop.iblogger.org/what_is_admission_quota.pdfIn PDF document text
    • http://makamar.tech/727798113106l61z.pdfIn PDF document text
    • http://ezfix.asia/how_to_fix_not_detected_flash_drivenoz7d.pdfIn PDF document text
    • http://lestyprin.online/seboturubosuykosq.pdfIn PDF document text
    • http://xewopixomimam.22web.org/formule_voor_berekenen_annuiteit.pdfIn PDF document text
    • http://edevletorg.com/computational_fluid_dynamics_jobs_switzerlandp8xfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vupafigimewex.rf.gd/xelawekogojezokanodekupot.pdfIn PDF document text
    • http://sefibonep.rf.gd/kannada_bhavageethe_songs.pdfIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_1ae899dccef841dc845fe07f5d1b962c.pdf?index=trueIn PDF document text
    • http://wisetijabi.epizy.com/botulismo_bovino_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1953863b-a883-4edd-9210-116d6e0c4065/vavafolojodamekuwosa.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_3a9172a2ea954cccbb8e6e8d7a1d9cfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f486eb6-b021-4510-9569-8a1ad09bbdc9/87257771077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a18c98-b978-4651-a288-6dfb2e93fca9/41943995762.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_0b4119df1a7847feba913badca41f7d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/953541e5-c461-4582-859b-cb46e3aa40d3/audiolibro_el_poder_del_pensamiento_positivo._norman_vincent_peale.pdfIn PDF document text
    • http://wutodabegaf.epizy.com/wbcs_zoology_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ac3729-7d50-4153-aa42-6194bf6c2b83/percy_jackson_and_the_battle_of_the_labyrinth_chapter_20.pdfIn PDF document text
    • http://gagonunanu.epizy.com/email_signature_template_outlook_2010.pdfIn PDF document text
    • http://siwodonodefofo.epizy.com/enlace_covalente_polar_elementos_que_lo_conforman.pdfIn PDF document text
    • http://bepafazo.epizy.com/syllabus_of_airforce_x_group_2020.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_96d9923d90d64b059511cda9ac5e8995.pdf?index=trueIn 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_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 5392 bytes
SHA-256: 269913deb243913311d6708d59c2c918c476be5193466968202467808991e8b5
font_01_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 10604 bytes
SHA-256: bd9bb469afee6b76c0c390e0adb565b968b7c0b8f4cea5ac3faf22cc835eeb94

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