Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba256e9be303c16…

MALICIOUS

PDF

179.1 KB Created: 2021-03-28 21:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e7e490591f56e30048cd4729a9e0129 SHA-1: d7fa5ed2fcf6ed5599f18a14f10cf849d3f4f3aa SHA-256: bba256e9be303c16466b553e39419cb57d4b2703878f4b59dc5b073c7c3d9e2f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a website disguised as a school staff list, likely a phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, and the presence of multiple external URLs suggests an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text fragments related to school staff and application metadata, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pelibifir.ru/wix?keyword=burrville+elementary+school+staff
    • http://gejokakop.mygamesonline.org/53695516863.pdf
    • http://pipabini.iblogger.org/96134910651.pdf
    • http://pupigojoniru.mypressonline.com/biomecanica_de_la_articulacion_del_hombro.pdf
    • http://tilosag.mypressonline.com/blackstone_fortress_escalation_datasheets.pdf
    • http://fuxakuzaporelu.iblogger.org/33966486560.pdf
    • http://temagezo.iblogger.org/xisejuvaboliwimiluza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_95be3c6b2339473fa56bb7b146fb35f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07c07747-8ccf-4383-bdb3-9219307dd5d0/8695656038.pdf
    • http://zasujofimak.epizy.com/pumerepizaxo.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_90d3c9afab5943fd88c7ecfb2f015a24.pdf?index=true
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_e16532a1ca6c4555b610cd90c806db7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11ee81c6-eda0-48cf-af1e-df0a9a3c82db/75652915451.pdf
    • https://uploads.strikinglycdn.com/files/a0b0f98f-f5fd-4c4b-8b47-19ca23538cb4/dlink_dir-890l_user_manual.pdf
    • https://s3.amazonaws.com/kawotexulozax/33136749683.pdf
    • https://uploads.strikinglycdn.com/files/903e2876-7bb6-47f0-9333-c4caf38cf35a/20656845340.pdf
    • https://uploads.strikinglycdn.com/files/37f03d5a-79f9-4d1d-a0e9-7b83377067ee/nepidinijanizideki.pdf
    • https://s3.amazonaws.com/kukazowox/best_powerpoint_design_templates_free.pdf
    • https://uploads.strikinglycdn.com/files/148ddd8b-9283-49ff-84dd-b23023fd4c98/41438851840.pdf
    • https://s3.amazonaws.com/gisujubolidine/dejesamun.pdf
    • https://uploads.strikinglycdn.com/files/e6cca48d-358c-45b8-a573-1983978f0c09/illegal_to_kill_an_elephant.pdf
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_30785a3f212f4131a1467d4a86995424.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_9bf9b02a0fa74f068a4e8e8e10c821ea.pdf?index=true
    • https://s3.amazonaws.com/meludav/70734716663.pdf
    • https://s3.amazonaws.com/kibavutibeved/moments_choose_your_story_apk.pdf
    • https://uploads.strikinglycdn.com/files/8df49589-e67f-4509-bb33-b33bef72bad5/10436842423.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_off000286d1.bin
a673dc7b95808bbfb46bde8eecae1be733ad717f646192a137083e0858b10daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x286D1 5332 bytes
font_01_sfnt_off000298d3.bin
f413bbcdd5a65be286ba961a73cc04ae038baf8d2aacf2b27fd9796afc4b5087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x298D3 11116 bytes

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