Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bbdbd65860ef18…

MALICIOUS

PDF

88.7 KB Created: 2021-04-04 14:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 406c7e20abb62ddbb8e12ea7410132e6 SHA-1: 3d798c7c285f34dcc33a53609c265b1c76d98da9 SHA-256: 46bbdbd65860ef183bf9c633a71c660acb060792479244db0d72df93dca502ba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'midufefew.ru' that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such lures. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=the+principles+of+ecology+word+search+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5ff60b355df49.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/bI3hcie/ripazakakobaga.pdfIn PDF document text
    • http://hookup153.space/what_is_the_point_of_view_in_the_yellow_wallpaper_apexyavm0.pdfIn PDF document text
    • http://biotringel.shop/role_of_co_curricular_activities_in_teaching_learning_processkv3dl.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/7rhih6l/xavisogapiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_6026795048019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_60102b044e449.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/zonobopasumi.pdfIn PDF document text
    • https://vubozunede.weebly.com/uploads/1/3/4/6/134685471/buvixafisevuse-vafolirefu-vufori-kipusuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_602c348cc3635.pdfIn PDF document text
    • http://bestunew.xyz/wheelers_oral_anatomy_download_freevskh7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fccdeeeccc7d.pdfIn PDF document text
    • http://mpvideo.org/pusolaxarifigawitaiaf5j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_6052b94e48ada.pdfIn PDF document text
    • https://cdn.sqhk.co/jezumasulej/aigTnhf/stadia_pro_vs_xbox_game_pass.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_602b6e5dbfe14.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/6VK5Mib/instrumental_beats_hip_hop_2019.pdfIn PDF document text
    • https://wulakeda.weebly.com/uploads/1/3/4/5/134592464/genega.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/1671950.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_fc864a4bd9354d9aa984c6f4aeb524c4.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_9a9851c764364645b1142338bebc646a.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_3b2d0e6772294e7d9b54a493e9495032.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_8cffa63e1b714ca4bf1006012f151be2.pdf?index=trueIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_36de05178e7d4faabe525c8a0227c6b9.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 1572 bytes
SHA-256: 86fea18fcca4af12b6451a3a7d82bf074c2f69e1994e916b264d01de7f8ea443
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 5332 bytes
SHA-256: d742e045fec71e10f43c9d8e1bca64f0bfb7e8d1046ea9a1733972257adbb752
font_02_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 11324 bytes
SHA-256: 70675ddc500435a0b0894d229fc803ce4e1d0263a3401de9b633743fe797c10f
font_03_sfnt_off000145bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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