Malicious PDF — malware analysis report

Static analysis result for SHA-256 5990e09b855cc81a…

MALICIOUS

PDF

75.1 KB Created: 2021-04-23 12:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3750f371af64a03abb7db3885dab1256 SHA-1: 59563f6a6fa9333cb0629dcddab68f96b0dbdd4a SHA-256: 5990e09b855cc81a8ac88346de7125ddf60bcf968468a3bad848177a1e6ba0dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://kuzutuzo.ru/strik?utm_term=who+moved+my+cheese+reading+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473340/normal_60478ce37a337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_60006b02a17b7.pdfIn PDF document text
    • http://wetudazuxuso.iblogger.org/ipazzport_bluetooth_mini_wireless_keyboard_for_apple_tv_and_apple_tv_4k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379371/normal_6005d90b9b597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5fff615387679.pdfIn PDF document text
    • http://niluxedofodip.22web.org/84396965593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481663/normal_60011a59435fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_6060dd2c079a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagugatukosag.epizy.com/kiguxuboguvuramopow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc80c581-5bd5-4f9a-84c5-8a8b8dff57d4/tilif.pdfIn PDF document text
    • http://kefowuwapurop.epizy.com/30700398541.pdfIn PDF document text
    • http://tibofova.epizy.com/5976110385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dab1ba6-e5a0-44c1-9d0b-d4fd6fe4cae7/metal_gear_solid_3_snake_eater_review.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_30c445e578a44911b73ed95ddbcca866.pdf?index=trueIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_df5594e6dca54e2e8b82d30b8e4b56f5.pdf?index=trueIn PDF document text
    • http://gobunapuvifug.epizy.com/ncert_biology_class_11_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9373cc7-7d6c-4ee1-87e8-14665d7b404f/gugidakolubowin.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_d787176323f440eeba2dfca9ab44f265.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/242f1aa7-9ac9-4fd9-b0a6-d73a683936f5/amazon_tap_user_manual.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_1fde37a479b04c45842d8073a46b6305.pdf?index=trueIn PDF document text
    • http://tapejufujol.epizy.com/39086737585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f19abd7-1670-4a31-bd43-a358e732cab9/94673192298.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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 5496 bytes
SHA-256: e4387925b1a61438bed21267f9b690098deed8b4c787c6178f9b5f62135b09c8
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10904 bytes
SHA-256: b3f5cdd968f7c72726560c049b803907d0607e7eb6a9b9da2f01e7ef48537311