Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c14f3d2862cd6a5…

MALICIOUS

PDF

81.8 KB Created: 2021-03-16 21:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 861b776e8df0e2c7d7c1f81c968904cc SHA-1: a66bcae1324493ecf077e8a36b44b14c0ee6d76e SHA-256: 1c14f3d2862cd6a5ad5286c270bf1cdbf2370fd048ad6f8b06bc0c2663a83266
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one pointing to 'xajibur.ru', flagged as a link farm on disposable hosting. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://xajibur.ru/award?keyword=editing+pdf+documents+online+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486037/normal_5ffa938189098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5fe320410e570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_6028f9642ecda.pdfIn PDF document text
    • http://kazaxidu.22web.org/what_can_i_watch_defending_jacob_on.pdfIn PDF document text
    • http://fujedavas.iblogger.org/economics_today_the_macro_view_fourth_custom_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_600f49d2bcde9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_604aa5d3e3fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_6036b46a4d14d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_9caa781d362847c6806577b47bb43e83.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_49d936e3131b4d99af5bfda9af4967c9.pdf?index=trueIn PDF document text
    • http://kovejenipo.epizy.com/add_bluehost_email_to_android.pdfIn PDF document text
    • http://vowefaxi.epizy.com/sylvania_headlight_bulb_replacement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/bjcp_guidelines_new_england_ipa.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/old_mans_war_book_series.pdfIn PDF document text
    • http://boledasedixe.rf.gd/durib.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_da16cdad46334043b8649aee695e196f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/grit_tv_guide_today.pdfIn PDF document text
    • http://tijawob.rf.gd/wisebebovapowakofabeluma.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_f7cf889c3f934552ae5dd51b1ac2e7ee.pdf?index=trueIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_30f951da44684c559aa21ae66804c524.pdf?index=trueIn PDF document text
    • http://vedisupekak.epizy.com/fosezosuja.pdfIn PDF document text
    • http://wiferowifi.rf.gd/how_to_install_gta_5_online_mod_menu_ps4_online_2020.pdfIn PDF document text
    • http://xesogopobatobop.epizy.com/jerugalesologu.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_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 5220 bytes
SHA-256: b9c192c25d09d6c3c51e159a043bd0dda30bed5c2eafe07241707520cc1959a5
font_01_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 10648 bytes
SHA-256: 2519ca5c769edf3fc8c87c97473f34c6c60e9d438fc27f714cf8324a2ccc748f

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