Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6061cbd90ea756…

MALICIOUS

PDF

118.7 KB Created: 2021-03-24 06:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c9d714f4b6f8f7dbf536e50094a3f8d5 SHA-1: 1a1a69fedee15f6e07d3d9e25ee241f55b47cfe8 SHA-256: bb6061cbd90ea756dd93e485f4a818513c3c580850509c7f11a65c3825eeba9f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF generation, reinforcing its nature as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=aime+cesaire+a+tempest+pdf PDF link annotation
    • http://gukiduwonaxinef.getenjoyment.net/82328816791.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/xoxunaza.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_to_get_a_vet_assistant_certificate.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/difference_between_inductive_and_deductive_method_of_teaching.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/pembuatan_preparat_apusan_darah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_5fdb071187d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_60514979e3516.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/cuantos_centimetros_equivale_un_metro_lineal.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/electronics_engineering_books_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_601cf7485f66c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ffc1eab95279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5fcc99c82b2c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mudurixo/zabiwifab.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_ed4d2c8da9534600af19c7fa43728eb4.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_2e6c04cd70184cf1ada6ca500df757c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/mexagorexebefadevizogiw.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/printable_worksheet_for_nursery_class.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/ceilidh_music.pdfIn PDF document text
    • http://ranitirunom.myartsonline.com/addendum_agreement.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/how_long_does_post_acute_withdrawal_last.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/button_with_icon_and_text_xamarin_forms.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A54 5260 bytes
SHA-256: c0820d81a93b8ef04c5e0c1011f8c61a3243963ecfab5a8bb954f81e391f6b61
font_01_sfnt_off00018c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C20 13524 bytes
SHA-256: 1c453bcd59049fbdf8d9a69a7831986f997eb6d7c74632f46db265b6819b3cab
font_02_sfnt_off0001b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6D9 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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