Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d40899828a979f4…

MALICIOUS

PDF

75.1 KB Created: 2021-06-11 13:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1f78e928fb6104b10dfd629b54402a86 SHA-1: 5136886ffd284fbf8db00b2db1781f8fd463fdff SHA-256: 5d40899828a979f4e59a8148e51c4d68d0fcb5adaf4ea615e6fa0be894f26652
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pixomot.ru/pbw?utm_term=ieltsfever+academic+reading+practice+test+11+answers PDF link annotation
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/gejodijudum.pdfIn PDF document text
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/najixolojum-xivimetixodivim-tamum.pdfIn PDF document text
    • https://vuzozemipasu.weebly.com/uploads/1/3/6/0/136051601/rijef_jefomozusolalu_gugowed_jerax.pdfIn PDF document text
    • https://mivorukeg.weebly.com/uploads/1/3/5/3/135348760/nerigapowopot-domupeb.pdfIn PDF document text
    • https://wojawuminusevob.weebly.com/uploads/1/3/4/6/134694879/jizigiv_zumijaxijoni.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/47e2c156963859e.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/kidusasuf.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/6882824.pdfIn PDF document text
    • https://pugufewosanagut.weebly.com/uploads/1/3/4/3/134331363/196281.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/aee1a6d9-cf56-4b00-b654-5880c3b669b6/jidufetepufoniw.pdfIn PDF document text
    • http://gogevuz.pbworks.com/f/35073936422.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/73837877939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2fe657d-b76a-458a-a855-7e4e37e26d24/causa_y_efecto_ejemplos_para_nios_de_primaria.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/nixegizu.pdfIn PDF document text
    • http://voveras.pbworks.com/w/file/fetch/144604869/is_mrunal_economy_sufficient_for_upsc.pdfIn PDF document text
    • http://divogatupum.pbworks.com/f/age_of_empires_2_conquerors_expansion.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/145100517/project_cars_2_app.pdfIn PDF document text
    • http://sirazumebow.pbworks.com/f/80237102972.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/zigexinazuralofirulixudeb.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 5296 bytes
SHA-256: c95d437ef6b68d5c152f2523172aa2dfc09f7f54612eeb6362c1426c581a42f6
font_01_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 10552 bytes
SHA-256: eccddeebd19d92c353483fbb9a011a1f65486288f8c181d01eecf8faf1331383
font_02_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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