Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87607cc41bb76e8…

MALICIOUS

PDF

79.5 KB Created: 2021-05-16 06:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 83fd18e5104c664af73b95e85d3d7ba1 SHA-1: fd07fdc7c9b3f62717d38aa5f48b58a882a4ca2d SHA-256: b87607cc41bb76e8b14ab4a2538c9dfe0b616ccca1574c22d1638dafd472f8fb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=grohe+faucet+replacement+cartridge PDF link annotation
    • https://bomobokoluv.weebly.com/uploads/1/3/1/4/131437025/6425082.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/e9iaThc/screen_recorder_android_app_free_download.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/1781029.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/aq0jjgj/tuzasazevusikewalitejil.pdfIn PDF document text
    • https://tonikajolokoge.weebly.com/uploads/1/3/0/8/130874266/2241298.pdfIn PDF document text
    • https://gubelowilesatu.weebly.com/uploads/1/3/0/7/130739845/5117055.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/4b6f7386aa16ed.pdfIn PDF document text
    • https://vazemewezasal.weebly.com/uploads/1/3/0/7/130775722/58cdc9bc.pdfIn PDF document text
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/9722696.pdfIn PDF document text
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/7aeba8e6a55456b.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/gcgd6gg/empire_of_the_ants_movie_1977.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/jepavilutabilel/argentina_flag_hd_picture.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_0af2fb8ddb5a442c83cd2167ba396d55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc9f3d1-2aab-4eca-a348-81fa9c7a90b4/electric_pressure_cooker_recipe_for_chicken_noodle_soup.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/is_the_after_book_the_same_as_wattpad.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/luigi_s_mansion_3_guide_8f_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa65711b-95fa-45de-8ca4-7632b0f46446/18821846066.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_cf1ead9be79a41a1947e11361bd70b9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/sekajegiranopudov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86da506-b4d6-4e9f-b013-8a14f769562c/esquema_de_trabajo_metodologa_dela_investigacin.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_6de7875355a54064b8543aba86dfcce4.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_254c9f1894ff4fc8b4094a830802bdd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/tuxazekezara.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_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 5304 bytes
SHA-256: 86e7bbd3d571564c6f0041e36783c36e15b6bd318f3329337d4ceef367f9fad9
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 10532 bytes
SHA-256: 0fb0a7dc6d72fbe4152c65e6d8bca5748c5e4b7451ee9060a3e7b517a6343604
font_02_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2