Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa9117804c76f28…

MALICIOUS

PDF

82.4 KB Created: 2021-01-23 14:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0e2354656268965fcd6b240aa9157e28 SHA-1: 168af9f92a5dbaf0bb22ae19ab7a1f2473d8b432 SHA-256: 9fa9117804c76f28b81cd49d53920740ce00b4ee2fd824cb2281f020d7dc5b7c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicating a link farm or SEO abuse. The embedded URL and the document body, though heavily obfuscated, suggest a lure related to a common search query. ClamAV and ML classifiers confirm maliciousness, likely due to the mass linking behavior.

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://trafficel.ru/123?utm_term=what+are+three+things+required+for+photosynthesis PDF link annotation
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/12f6197696542fb.pdfIn PDF document text
    • http://sunipemumax.66ghz.com/movies_counter_inception.pdfIn PDF document text
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/zuretirorezalodapezo.pdfIn PDF document text
    • https://site-1166616.mozfiles.com/files/1166616/footballer_soccer_stars_color_by_number_game.pdfIn PDF document text
    • https://site-1250681.mozfiles.com/files/1250681/usg_sheetrock_30_mud_mixer.pdfIn PDF document text
    • http://komamoj.22web.org/analisi_logica_facile.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/hhdJyjf/52738334252.pdfIn PDF document text
    • https://site-1178850.mozfiles.com/files/1178850/73325689891.pdfIn PDF document text
    • https://site-1187516.mozfiles.com/files/1187516/92819549982.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/jghjihf/classic_hearts_card_game_free_download.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/4cd1cbb86ea.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/tamir_sujubekonevo_luwiwa_ruponajigati.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://s3.amazonaws.com/bubisifapagefe/reading_ielts_academic_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/benchmark_performance_software.pdfIn PDF document text
    • http://wavusuwu.epizy.com/tiputumuno.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/50037164896.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/ryanair_mobile_app.pdfIn PDF document text
    • http://togipumenotu.epizy.com/leveson_report_key_points.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/junixufasisot.pdfIn PDF document text
    • http://zutulig.epizy.com/vibelerobu.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_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 5392 bytes
SHA-256: 2e01c244cba976f4305c88403653509ac6d36f2a71a1976555dc1b911d17b67f
font_01_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 10292 bytes
SHA-256: e8f78cf683ac4b69c26e6c5bece18170946812840dc8e449f2947a1883ec6cc9
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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