Malicious PDF — malware analysis report

Static analysis result for SHA-256 924adf533029c681…

MALICIOUS

PDF

76.4 KB Created: 2021-05-11 06:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: da1982b364ee6f14f6d90a603431d447 SHA-1: 9a92e6026d216fac4aafe96b2451dde74c02bbbf SHA-256: 924adf533029c6811572f7ea5b03fd4f5f6f09b346f6046c806a57de6de20672
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it functions as a link farm designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the extensive link farm is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=is+it+bad+to+listen+to+music+while+running PDF link annotation
    • http://fifamarketbot.com/lanasaditavunojeseveximetibiw.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/73633670330.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/jdjbWha/day_r_premium_latest_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/agihgi8/17410671250.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/U6YRaHq/97645739408.pdfIn PDF document text
    • http://spindlndou.space/harry_potter_y_la_orden_del_fenix_libro_tapa_duravaavj.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/logiciel_grammaire_conjugaison_franaise_gratuit.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/ja9hAjj/gwent_android_review.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/the_girl_with_the_dragon_tattoo_story.pdfIn PDF document text
    • https://cdn.sqhk.co/digubamot/hvYjdhg/bimududejaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safedoguno.onlinewebshop.net/colibacillosis_in_calves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/099557d5-7f45-4b46-8dc7-d408e08e31ff/mycelium_running_paul_stamets.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_e1e18401c7784f76ae9a812068f1b4b2.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/tafigenomerumatuwamev.pdfIn PDF document text
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_1f4c428c39364a12ab73747035a1cf0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f270f8-8999-46ce-b490-4855f940fb72/weka_tutorial_exercises_answers.pdfIn PDF document text
    • https://e474413f-ff6d-4b46-a00c-d4c33541206b.filesusr.com/ugd/ddecc0_c33be63869f84fe69c96e5bae545e395.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9339cda7-b879-47e3-90bc-532dcec38017/metaphor_games_for_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85da891-67d7-4346-b9ed-3e03344add7c/pentair_easy_touch_remote_sync.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205725bd-70b6-4c19-b764-1b1dd1c3f3c0/craftsman_air_compressor_regulator_repair_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63684a40-a424-4bbf-9995-9382a9d7554f/sony_a6500_review_for_video.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_d1a9d06164be464a9a5ca85061fcb72f.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_95d343f4d9404ca3ac952da813bca6ae.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_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 5520 bytes
SHA-256: b12b3efc08533e14c840bc8fc555e790d97e72792a6bd22fd8968070124ffc9f
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 10532 bytes
SHA-256: ea8a4eed7d95b47e885c40c93acf9ffc5900a4f1a7a1022f92fa6221c5c5ac57