Malicious PDF — malware analysis report

Static analysis result for SHA-256 506fb895c6580e67…

MALICIOUS

PDF

74.2 KB Created: 2021-03-10 08:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42d69be3f1cbce3619f73044d3ccbe81 SHA-1: 78f087c7eabdda01a83b961c9f2f0de3a531f84d SHA-256: 506fb895c6580e67f1559019a5426d13e7b4745fd4c78b82ee8b986db082548a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. One prominent URL, 'https://xajibur.ru/award?keyword=thinking+in+java+pdf+github', appears to be a lure, presenting itself as a search result for a book. The PDF structure itself is also suspicious, with a high number of embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://xajibur.ru/award?keyword=thinking+in+java+pdf+github PDF link annotation
    • http://gujufifirisin.22web.org/ishihara_color_vision_test_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fivapipuxe.rf.gd/tacitus_annals_12.22.1-4_dio_60.33.3.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_71d937b469ee42dc824b197fb46054b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/finumex.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/66345540078.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_50a23dd8eb5b48d694702041aeb277f4.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_12f5744a4eb64806a48f68cb731bd672.pdf?index=trueIn PDF document text
    • http://vakorizu.epizy.com/55034928836.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/lunopefitatimotazoduboleg.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_4f2e22546d7e490382da3d95552cbd42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/56010215729.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_5962a5fb73e74c62b9dd56c433b87743.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/remove_ads_from_apps_android_root.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/goxamezijema.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/6621229553.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/challa_uri_video.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/76132823057.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_957415cc1ff742d0b8d88c1da89874c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/how_to_program_my_remote_to_my_cable_box.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/46899154429.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_89db55bf8a0840f0b35f4b448adb9a32.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_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 5288 bytes
SHA-256: a5c2f1f9cc9ca8164186882e6306f62e5cf8a2c68ec386d034361c7a53d08ce2
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10240 bytes
SHA-256: ce39110d166154e84d83ff4fde0623696e01c105fe46c7bcab01eb3a0bffd765

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