Malicious PDF — malware analysis report

Static analysis result for SHA-256 316a937d6c34c4cd…

MALICIOUS

PDF

80.4 KB Created: 2021-04-03 12:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e1c91b2ba7e7f8e69f0a7e175ceaf08 SHA-1: 7d6d1743b2f3a8b45e03064768ca15edb0e192d2 SHA-256: 316a937d6c34c4cd0876f604e98410d3d7722aa0062d24d07b90b87ffa68519f
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'jottigo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to Jitterbug smartphone troubleshooting, designed to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=jitterbug+smartphone+troubleshooting
    • https://cdn.sqhk.co/zenetofuma/jodEghA/jeramevejel.pdf
    • https://cdn-cms.f-static.net/uploads/4373239/normal_6023f105252ea.pdf
    • http://hdsamara.ru/sunbeam_twin_heated_blanket_sizenw0h9.pdf
    • https://cdn-cms.f-static.net/uploads/4479222/normal_5fe898350dea1.pdf
    • https://cdn.sqhk.co/numisezopo/9Imiazy/cbc_tv_guide_egypt.pdf
    • https://cdn-cms.f-static.net/uploads/4380699/normal_603250241f3bc.pdf
    • https://cdn.sqhk.co/linaxezo/idghiLZ/the_new_york_times_front_page.pdf
    • http://zotikarida.medianewsonline.com/cooks_essential_pressure_cooker_recipe_book.pdf
    • https://cdn.sqhk.co/wemonamo/iehfdPQ/wazuruze.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_6021c848595d4.pdf
    • https://cdn-cms.f-static.net/uploads/4499341/normal_604fb57c7e60a.pdf
    • http://copyrightsupporthelpcenter.com/summary_of_the_lorax_bookkc51w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovitiku/murolebuxid.pdf
    • https://s3.amazonaws.com/dukavunivifa/example_of_external_css_stylesheet_code.pdf
    • https://s3.amazonaws.com/ruzaganog/how_to_turn_on_ryobi_trimmer_plus.pdf
    • https://uploads.strikinglycdn.com/files/2fb4ffc3-86dc-49c4-b24d-6361eedccd61/gopro_hero_3_owners_manual_download.pdf
    • https://s3.amazonaws.com/rutufokedizon/lomupoj.pdf
    • http://totefopige.atwebpages.com/xefeburavekuzexemoxasaw.pdf
    • https://uploads.strikinglycdn.com/files/719a9e8a-6a4d-4e50-bb02-127816b02cda/negafevosoxuwurenilomusi.pdf
    • https://s3.amazonaws.com/nijosinizo/borumapaka.pdf
    • https://uploads.strikinglycdn.com/files/67b9bc3c-3a68-46e8-82fb-c2bb87105965/mazobulusedemiliben.pdf
    • https://uploads.strikinglycdn.com/files/af003c83-ad80-4d44-b100-cd208450cce7/p90x_chest_and_back_workout_calories_burned.pdf
    • https://uploads.strikinglycdn.com/files/b4ebb106-bbb2-4915-a3e8-286f8a5434dd/zopib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac6.bin
78e4f53fbd4db0a2acada9a4cd704ff6c06babbd4e2a614b7dd4150f8c66c231		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 5360 bytes
font_01_sfnt_off00010cd0.bin
10d9e92e9c06965d49db77911e32a1cb79c1ab4708fd942e6bddde63c68c4e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 11560 bytes

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