Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abf51136b5231f5…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 04:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead2fbe4298a50cedc0f9a5a59abd622 SHA-1: 39f6f855003da2742815cbdeb09ff9f727def565 SHA-256: 5abf51136b5231f5ea9d7b49e1653ef26e7bedb1f926ec0caca8ec523b6eb6bd
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file. The document body, though heavily obfuscated, appears to be a lure related to IELTS preparation materials, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://maypoin.ru/award?keyword=makkar+ielts+speaking+topics+january+2020+pdf+download+free
    • http://afracheat5.xyz/sat_subject_test_scores_release1e9n1.pdf
    • https://voviteri.weebly.com/uploads/1/3/4/9/134904749/leduxaduzisuberifam.pdf
    • http://1xbet-registrat.site/irregular_verbs_in_spanish_listxxvll.pdf
    • https://rojurunonujimos.weebly.com/uploads/1/3/5/3/135325454/7299627.pdf
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/bulevevekizutip.pdf
    • http://verifybadgehelp.com/sidijuboxekezewexetuhbuvx.pdf
    • http://italywow.info/are_arbys_wraps_healthy349e5.pdf
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5ff32659c500e.pdf
    • http://dompodklyuch.com/withings_ecg_watch_uk3t6o5.pdf
    • http://logvoz.ru/56387665670hn48o.pdf
    • https://pepajodik.weebly.com/uploads/1/3/1/4/131453945/648042.pdf
    • http://clientbluebadge.com/6200850374eu47t.pdf
    • http://the-glow.ru/how_to_support_someone_who_is_stressed_at_work645i0.pdf
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fe80f1630e9d.pdf
    • https://zapubotugor.weebly.com/uploads/1/3/4/6/134635013/jurur-tizalamatesemel.pdf
    • http://alifan.store/blank_map_of_canada_printableq7r66.pdf
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5fdfd9054317f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://savexopuzasi.epizy.com/58326516059.pdf
    • https://uploads.strikinglycdn.com/files/8b1d3f5d-c78d-436c-96dc-1067587c1f6b/ipad_mini_2nd_generation_screen_size.pdf
    • https://uploads.strikinglycdn.com/files/4f023beb-3f95-4948-b55b-61d01fccce1c/willy_wonka_and_the_chocolate_factory_songs_list.pdf
    • http://nobubuti.rf.gd/clasificacin_de_funciones_algebraicas_y_trascendentales.pdf
    • https://uploads.strikinglycdn.com/files/159803ed-4d88-4dde-a48c-5df78965d09a/zetinudifonuwamuzomulogo.pdf
    • http://zugujegezamuto.epizy.com/19521449850.pdf
    • https://uploads.strikinglycdn.com/files/9cb5ad87-c9dd-403d-a115-966f5b72e567/sharepoint_2013_workflow_not_starting_initiator_anonymous.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_off0000f706.bin
ba00a52b4691ef922ec4cf8dafc9c283d5c0862da57b73e431471efe573582fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 5936 bytes
font_01_sfnt_off00010b7a.bin
c3052ad41241d447b6a838d94ba3890a08673a9a529d58495ec5dcba5e56abfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10228 bytes

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