Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d847b9cec4ef20…

MALICIOUS

PDF

88.5 KB Created: 2021-03-21 08:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 99f115d58a501a700aac0dd3a5a3f719 SHA-1: 503ae6effae0aea0e5c7a1b55b2fe37f3bc974fc SHA-256: 41d847b9cec4ef20847455633ddac91711abd30d6e73ca5b314d60d82a9d3646
186 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=shimano+alfine+8+maintenance+manual PDF link annotation
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/7187927.pdfIn PDF document text
    • http://maewallace.com/zelelozitabuzipojiregiffmcu.pdfIn PDF document text
    • http://logorag.22web.org/wodeziwiron.pdfIn PDF document text
    • http://bestunew.xyz/91725043620iip8v.pdfIn PDF document text
    • http://cosmosqrab.online/rukuludb9eb.pdfIn PDF document text
    • http://zathkatow.xyz/are_mitsubishi_eclipses_reliable0kwy2.pdfIn PDF document text
    • https://bebopajuze.weebly.com/uploads/1/3/5/3/135312866/1331832.pdfIn PDF document text
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/xuziwerive.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/xabapo.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/437087599905c.pdfIn PDF document text
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/361893.pdfIn PDF document text
    • https://sudiduku.weebly.com/uploads/1/3/1/4/131452825/6584954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_e478404808b64816a9b86dfd65738553.pdf?index=trueIn PDF document text
    • http://savikolapuxol.rf.gd/barbie_and_the_diamond_castle_song.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_bdf7ed26d93d4c67a160feea7bb3ac0a.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_48ef4297ed284df0a7a7af825c60b3a3.pdf?index=trueIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_5dec66f0af484f2ead8658c4e687833f.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_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 5144 bytes
SHA-256: 8a409245950757cc31cb1283637063fbaa47635638d659676f3fa04013a2cadf
font_01_sfnt_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 12980 bytes
SHA-256: ccc5288297b2ff2a4160ead823fc9af5c3d6028570b9975cb2d42dd545f6ed76

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