Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51fb525558c3240…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 22:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff24ea3d5c3aa3955816e9b601a857e5 SHA-1: 9acbaa423a7155a6782d3a9a6d320e7f68092946 SHA-256: d51fb525558c3240f075f4440e391bfea930524adac0cb92a94bad32f2c766d4
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 0.9990

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://jottigo.ru/wix?keyword=discovering+psychology+the+science+of+mind+2rd+edition+pdf+free PDF link annotation
    • https://cdn.sqhk.co/kinibemazoz/28gfjid/zuzugetevobujojibiriripi.pdfIn PDF document text
    • http://negozio50sconto.info/basketball_game_video6navm.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/samsung_ln32b360c5d_price.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/hari_arora_applied_mathematics_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5fd627a69b642.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/73555779643.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/fzgjiaE/calendario_2018_paraguay.pdfIn PDF document text
    • http://vknart.xyz/fakibilokov9wjc.pdfIn PDF document text
    • http://regvoolkim.website/kawologusuzavulakamepore2n0vi.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/dokemigubiboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_6049d8878e5ec.pdfIn PDF document text
    • http://ses-paypal.com/jeepers_creepers_3_download_720pcphco.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/bhQgi7a/46208374678.pdfIn PDF document text
    • http://optamorem.com/livro_de_zoharar1zv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457838/normal_5fec86d4e9214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad799fcf-5347-4c66-91d3-3f3961560630/63337028377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e12cc7-b3ce-4d68-879e-ebb3e58f9470/traductor_espanol_portugues_de_brasil.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/21469689012.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/lenujaxofomolebo.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/19450659179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b447861e-72a7-4750-b688-5c33a13a900f/phrasal_verb_step_off_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/ayodhya_tamil_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9609cd-1c2b-46d2-bddb-88fa19a64002/87394091931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf38917-d09a-4a4f-bb94-a6af3d045301/ximufe.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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5652 bytes
SHA-256: 05e1399fc2eab1aff9a91318cc6cc3ebccda7e2be53b1b74ada41edf689b2a33
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 11304 bytes
SHA-256: 8f2d4cadf7b32a10a3ead620966ed6b6729c8df32725624bbb6c72b1dedcb902