Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaa95a5010a6c00…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 20:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee0b08e48f862e6b1658b782a6b57473 SHA-1: 1847453308f95bc628d097264abc3776e62ff99d SHA-256: acaa95a5010a6c00091abbd2531eb073e9f8628bf58222487c20f73243d641c4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely lead to further malicious content or phishing sites, and the document body, though heavily obfuscated, suggests a lure related to 'Ayurveda quiz questions'. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=ayurveda+quiz+questions+and+answers+pdf
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5ff363973b55d.pdf
    • http://wekixelov.22web.org/ccna_3_chapter_1.pdf
    • https://cdn-cms.f-static.net/uploads/4412591/normal_600f054011e4c.pdf
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5ffcd3cd1526c.pdf
    • https://cdn.sqhk.co/dudavizi/jNSPgcJ/bollywood_movie_in_hd.pdf
    • https://cdn.sqhk.co/xavaxonad/DzhgZjf/ludo_club_game_free_download_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gavapozalilup/35647126874.pdf
    • https://s3.amazonaws.com/vovopafubipu/guduxepifivunagirekasajo.pdf
    • https://uploads.strikinglycdn.com/files/3bf697dc-5a6e-4ba0-83ce-0ce4db9e7ee2/tuxezulovibusowemalasog.pdf
    • https://s3.amazonaws.com/fekazudabo/analytic_geometry_parabola_problems_with_solutions.pdf
    • https://uploads.strikinglycdn.com/files/7b78d351-56a6-47b7-abef-c88d6c2c81bc/55529295647.pdf
    • https://uploads.strikinglycdn.com/files/71eb24ee-efa4-4399-924d-7881a72d3f08/how_much_is_newsmax_tv_on_spectrum.pdf
    • http://nudifezidezi.rf.gd/nebura.pdf
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_a5077320d59840b49e85e9fb33c1dfa1.pdf?index=true
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_8e3c74a889574cc0b6212a4921e61981.pdf?index=true
    • http://jodekiwob.rf.gd/koxadafusedunuganukajo.pdf
    • https://s3.amazonaws.com/jinabom/measure_what_matters_okr_starter_kit.pdf
    • https://s3.amazonaws.com/fedufiporara/what_are_the_characteristics_of_invasion_games.pdf
    • http://kutiliv.epizy.com/39263752678.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_off0000fb01.bin
f28bc04c3da9475d7d5c863845177d129f0ec881ceab4f7f98778a4e57e940c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 5420 bytes
font_01_sfnt_off00010da6.bin
7ad4d3ca3f48e0b6b9e8055e4ecc211b3b76dfddd7bff20a13d20d3a51adcbb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 10776 bytes

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