Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecef56f8cf90c460…

MALICIOUS

PDF

77.8 KB Created: 2020-11-18 01:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9f4bb0f643e832e2c4c974722408d791 SHA-1: 9b86ce81a55f56ea0b61813510e58111db417305 SHA-256: ecef56f8cf90c46075143a85de615fc9e7c5c66424b917354a51fc6b528347c6
156 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 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 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.
  • 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://trafficel.ru/strik?utm_term=airavata+kannada+movie+mp3+songs+fre PDF link annotation
    • https://bilimetib.weebly.com/uploads/1/3/4/4/134435282/2997167.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/3538618.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/9464cdfa-525c-4ad2-bcb0-e53a336ed51b/xozobijufiresojojegoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce09ab17-8ea1-44ab-b71c-d730692093d9/bloom_taxonomy_learning_wheel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec40d08-6de2-4fa1-b338-45fc150d51d1/61849611906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1012f562-2a4f-421e-a153-96790ca617d0/partes_de_los_cuerpos_geometricos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b216356b-3620-4c0c-b799-6deb8b1430c2/tabla_z_estadistica_nivel_de_confian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a202efe-b704-424f-bdcf-e0d34ec0309d/96877062979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413cfb6e-58f8-4dbc-b5da-cc9067f5d8ec/creative_n10225_camera_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1082eae-4479-451c-ad84-ae87c4e572cb/bapitixakofutumini.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000105b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105B6 21344 bytes
SHA-256: 955966bf72665a34c31bd118d90af5d9b56c1a2fef211c57abd4a73942b07f52
font_00_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 5604 bytes
SHA-256: b02495f64a7b20c8e0c1e98d3cc0aee17e1874d6f1eef76b106adc2d37ef54ef
font_01_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 10852 bytes
SHA-256: 7da9c3041f319b57596f7968bdbc512c21ab20b89d50f2e16defe53c56a2527f

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