Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6550f739a247233…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 01:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cb082abd0e2eb440cd1d6ddef5f3343d SHA-1: c346510c32030c937af390b1436eb84e1efbd7d8 SHA-256: d6550f739a247233f2f678cfe60aa2c01c0cbad57663accbbec6f505a6875565
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as academic resources, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to obscure the true destination of the links, likely leading to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=thomas+calculus+early+transcendentals+13th+edition+solutions+pdf PDF link annotation
    • https://cdn.sqhk.co/fifibaje/hdfc7he/dstv_channels_guide.pdfIn PDF document text
    • http://torchland.xyz/rezebiguvu06hyr.pdfIn PDF document text
    • http://xonibiz.22web.org/99628900587.pdfIn PDF document text
    • http://thestablestl.com/dolafodozelarwuoll.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/hjjbnei/fejosufugikovesikene.pdfIn PDF document text
    • http://neuroncraft.online/vaaste_song_dj_remix316wo.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/iaeUp5i/4395235452.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/dgigibi/23960946287.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/gjicAjd/3576686874.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/how_to_reboot_samsung_tablet_4.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/whirlpool_cabrio_repair_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cba02d19-d3be-4cbb-a327-e6eecdcbd762/fifaxoremitapafuziso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b68d4aa-3d02-4187-acfe-f3523dd4c018/matlab_plot3_color_line.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf5e474-ce26-4fb6-ad26-87047754c7fb/fairy_tail_anime_characters_male.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/bosajewuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f14b023-2187-4ba2-af0b-f34f605e5273/sena_20s_20s_evo_30k_einbaukit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d43c390-5a01-43fb-8894-18abf1151af3/curso_de_marketing_digital_online_gratuitos_com_certificado.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/what_makes_americas_education_system_great.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcfcbb9-ace4-411b-8d81-9e6614fee387/titap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5544 bytes
SHA-256: c391fc66b161bd357098d560def5d23f55517017ad6eff9c5c3e288ccff89e06
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 10496 bytes
SHA-256: 9e8fea5cd7ab0e4c58e131791b48c009c01876ee696d7b42dbb9056565ed0cdb
font_02_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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