Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab94c8f24d89e79…

MALICIOUS

PDF

76.5 KB Created: 2021-06-04 17:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8d8650f0b1928ee5bf5fe40e0859c716 SHA-1: 27de6d7b31cc2d0c4262e7ebf1d066a4a09f56bd SHA-256: aab94c8f24d89e79b8f5aaa766fb2eb59505d3ed48dae5f461b63ee5c45f8d2a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to 'Romeo and Juliet' comprehension questions, serving as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/pbw?utm_term=romeo+and+juliet+act+2+scene+2+comprehension+questions PDF link annotation
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/vuxavilusewubuzuduv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403683/normal_6001f689dfa29.pdfIn PDF document text
    • https://dotubebiwujodej.weebly.com/uploads/1/3/4/7/134701593/4efb2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_60b902e42c153.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/lawinebatujimoxo.pdfIn PDF document text
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/wusuxat.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/ae0ba36e7e.pdfIn PDF document text
    • https://bitabado.weebly.com/uploads/1/3/1/4/131436956/4650794.pdfIn PDF document text
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/vakefasumamuvod-tawuvejirusip-votivovulu-xinowuzinawe.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/polekorogo-bupos-natimifile-wegemumo.pdfIn PDF document text
    • https://lovokavupas.weebly.com/uploads/1/3/0/7/130776776/bf04e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403260/normal_5fdf39a831242.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/9687f7a7-c424-41e8-8b69-4898e43bf3cc/hobby_lobby_near_me_directions.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/91348370467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f9c2f2-91e7-47e7-9bea-e87fa78a6dfd/suzuki_piano_school_volume_1_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ec0379-e73c-45de-9e8a-6351799a6c52/8206280045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab44aec-335b-42bf-8eac-e8684b35462e/gothic_3_enhanced_edition_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ae68b6-8ef9-43df-b472-d9ce9ad6e1af/how_to_install_google_chrome_on_mi_android_tv.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/apocalypse_of_zephaniah_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8f1d14-9527-461f-ad09-f2796a6cd682/how_to_play_dungeons_and_dragons_starter_pack.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144437838/93091358059.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144462831/schott_ceran_error_codes_l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a1d361-7242-49b6-b6e0-3050142a3c5f/23767525033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d6cca3-a17e-45e4-9148-e9d1704815ca/what_are_the_3_types_of_metabolism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b245d5-bec3-483c-9504-0f4fec5c9f21/the_art_of_leadership_george_manning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2970551-9521-4c86-a35c-2c198755b038/attorney_termination_letter_sample.pdfIn PDF document text
    • http://lipadune.pbworks.com/f/descargar_juegos_para_emulador_ppsspp_android_mega.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 5656 bytes
SHA-256: c9b6182329cb02c396a1fb7759de4026bb8c96c273ef9b0b50852e7974c0c717
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 10396 bytes
SHA-256: b808900036e9eb243534c1d4fc135d91e83052dcf79f378d0f34572929bf717d

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