Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2454fc1f8127d8…

MALICIOUS

PDF

108.7 KB Created: 2021-01-12 19:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f5faf2fbe339a1aa3abe904719017c19 SHA-1: 7a8ccdec08e4bd9dfc3bf7272123bcddbc0b25ea SHA-256: de2454fc1f8127d838dd80cb4d1585df145f4490aba59ed31dec41b49f18bbb7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains and S3 buckets. One of the primary external URIs, 'https://trafffe.ru/123?utm_term=birds+that+are+blue+in missouri', is suspicious and likely leads to malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=birds+that+are+blue+in+missouri PDF link annotation
    • https://cdn.sqhk.co/wejagamewo/xKijHic/xadefokoronumemuniw.pdfIn PDF document text
    • https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/kisixugisoritu.pdfIn PDF document text
    • https://cdn.sqhk.co/dobopejig/1hjvrYh/wakokogavonigirozonulebi.pdfIn PDF document text
    • https://site-1195301.mozfiles.com/files/1195301/zetofenexubola.pdfIn PDF document text
    • https://dizodedijep.weebly.com/uploads/1/3/5/3/135391654/likan.pdfIn PDF document text
    • https://site-1176088.mozfiles.com/files/1176088/40424881564.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/pardesi_anthem_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/aplicativo_itau_personnalite_para_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/vuzanajar.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/lobosakonezifaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/open_the_bottle_video_song_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/natefediwofisitovi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/define_cloud_based_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/true_colors_workshop_test.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000179ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x179EA 24312 bytes
SHA-256: 07b6a6c07f05d9be7a083852d033a8ef730887aebc7de55b0959126cbcf22bb9
font_00_sfnt_off000144e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 5256 bytes
SHA-256: 89a04085b6fc8428ce8f7a6bef9c8f0d4a1816aba38d8e891dd199cb262d1822
font_01_sfnt_off00015694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15694 10292 bytes
SHA-256: 8afddbe58185118a7a33f05ec963d2977c8e43cb5b7f248dd405b6b492da02cc

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