Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a5d9ff86b501d3…

MALICIOUS

PDF

88.9 KB Created: 2021-04-23 00:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9a4c8d163a69fd04a357aca5e385229f SHA-1: 51b63c58322fbf05802f82331f0b89df9e3f7e3d SHA-256: 37a5d9ff86b501d36ed09bba0a76734ad392891ec045b71182c9634ae9b7ec3e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were extracted, the structure and URL patterns are consistent with phishing lures that redirect users to malicious sites.

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://xajibur.ru/strik?utm_term=how+to+operate+cobra+walkie+talkies PDF link annotation
    • http://zujejilolo.scienceontheweb.net/78371348906.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/bodadiroboli.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/chandamama_stories_in_telugu.pdfIn PDF document text
    • http://onlinetyz.xyz/is_500_mbps_fast_enough3uemz.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/pupotazawutemimuzuseje.pdfIn PDF document text
    • http://1freedom.space/40416616258ovxxe.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/cuantos_casos_de_covid_19_salieron_hoy_en_el_salvador.pdfIn PDF document text
    • http://nozatisesufi.scienceontheweb.net/fipodowotelur.pdfIn PDF document text
    • http://tugeredenazej.mywebcommunity.org/khadya_nagrik_aapurti_vibhag_mp.pdfIn PDF document text
    • http://cherrypimp.online/13467537414y0xo9.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/69104526128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wumugajus.onlinewebshop.net/how_to_replace_samsung_j3_charging_port.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b5ccca-2a85-448d-b5da-80489af96561/how_often_does_a_2012_honda_civic_need_an_oil_change.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_86e9d207d00f40e3895226017645647b.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_d154ad6b54784658b4368b9b9c7c4878.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_0141ec95f4434b8680b1cf8791116fba.pdf?index=trueIn PDF document text
    • http://medazupu.onlinewebshop.net/calvinismo_x_arminianismo_quem_est_com_a_razo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2779cd59-4ca6-44cf-9ac5-2b8eb1c9df59/walakozirovapo.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_0d061995b98d4dffb12890f819378b78.pdf?index=trueIn PDF document text
    • http://nerezusilanake.atwebpages.com/51413088548.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_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 5184 bytes
SHA-256: 728b074a87ee276cdd62845777d184cf48363de9044465d873b46ad4ce50b565
font_01_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 12172 bytes
SHA-256: cf7f3ad91d128a88880705346bb0fcddbca37fc4965f5677a189a1e9d39e59c5

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