Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebddb26512d9c1c…

MALICIOUS

PDF

305.6 KB Created: 2021-06-04 23:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9c16c497faed0e29b7a9c5803c430d04 SHA-1: ae2d60765793bdd9426d4d206c80995a49198d8b SHA-256: 8ebddb26512d9c1ca66d1b3ecbf58d2a8197488d888eeabed45b24d78ae4015f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/123?utm_term=insomnia+treatment+guidelines+2018'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a compromised site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/123?utm_term=insomnia+treatment+guidelines+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_602da1496aebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_60507667aceab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_60053532f067b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_60191cfa3a836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca0bdd5-dbcf-4525-a801-d7d749748e7e/wuvov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0a1795-7e0f-4fe6-ad9a-3d9e5c38d545/how_to_ease_sciatica_pain_while_sleeping.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/sizodajexawunot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb95b61a-e787-4f53-a329-241df630a4c9/gopro_hero_3_plus_silver_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340957c8-e457-42d0-9863-8410133aed54/gevitujalinobalagasog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5063d9df-1b35-49f7-a0cb-b457fc467c9b/kodirijav.pdfIn PDF document text
    • http://likanegi.pbworks.com/f/82026605865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503783d6-798f-4496-b438-cd7bc15c7d13/vicks_mini_filter_free_cool_mist_humidifier_small_humidifier.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/the_14_day_fertility_meal_plan_free.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144529167/mxq_pro_firmware_rk3229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f3c7c9-4ecd-413a-a68c-256676cd28e3/17775620539.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144499767/suwolomera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478c796f-a4cb-486b-8a03-7cb3c74093ed/21403300106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb77392-6c78-465a-b16d-623c36ca131f/what_alice_forgot_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a743632-2fd9-47b1-a96a-53deb63d32ea/87611297045.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_off00047af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47AF8 5600 bytes
SHA-256: 0f1baaf7aa9096c9aa17e11ca557d4e14b6d9ded50aa396c1f2061791721f763
font_01_sfnt_off00048de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48DE2 12424 bytes
SHA-256: b7319fba7b05e6d1160ade2c0f4f5cde6b808c78081f4f5fc81c0fef5f7b1e07

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