Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ad40b5604e6e7a…

MALICIOUS

PDF

179.3 KB Created: 2021-03-30 06:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acfdc26bd9af36f0a6a85b9c2b8fe403 SHA-1: 94bff93296fb1c62069886d7e5a001c597fa153a SHA-256: 90ad40b5604e6e7a1e6d4aee2f52477ff8f4ea29e57030258f12cb8a6f95954d
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://maypoin.ru/wix?keyword=piedmont+elementary+school', which is likely a phishing or malware distribution site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/wix?keyword=piedmont+elementary+school
    • http://boribonabone.mypressonline.com/rurivuja.pdf
    • http://gopadaxin.mywebcommunity.org/96879650862.pdf
    • https://cdn-cms.f-static.net/uploads/4375358/normal_60184ecbf21f2.pdf
    • https://cdn-cms.f-static.net/uploads/4467043/normal_6015c81020632.pdf
    • https://cdn-cms.f-static.net/uploads/4416144/normal_6012791b74efd.pdf
    • https://static.s123-cdn-static.com/uploads/4449996/normal_5fdeb30932850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5ff79726-e2de-4f01-bcf1-1fdb33a184e2/88969598011.pdf
    • https://uploads.strikinglycdn.com/files/c0cecda4-c92f-4da3-bf1b-d5e83c52b02d/como_obtener_visa_de_trabajo_en_espaa.pdf
    • https://uploads.strikinglycdn.com/files/d1a0a117-aa80-4858-8dcc-3364d54b1459/fovaxo.pdf
    • https://uploads.strikinglycdn.com/files/65584781-bbe1-44c8-b6fc-f443e8b244a9/72383761512.pdf
    • https://uploads.strikinglycdn.com/files/d2b545ed-e550-4e0d-93e1-a7fa4e4ad62d/how_to_do_grounded_theory_coding.pdf
    • https://uploads.strikinglycdn.com/files/fc7df4c8-ad25-44cf-a8f9-d986895d7abc/star_trek_discovery_season_1_episode_7_watch_online_free.pdf
    • https://uploads.strikinglycdn.com/files/ab8de7a2-d0f3-449b-8085-a8bc89620d8f/matlab_plot_multiple_lines_with_same_x.pdf
    • https://uploads.strikinglycdn.com/files/87482b29-0233-48d3-9e80-0b8a5643c2fc/locate_missing_songs_itunes.pdf
    • https://uploads.strikinglycdn.com/files/57bff866-c4e4-4d6c-b135-be3323c609b4/32626164285.pdf
    • https://uploads.strikinglycdn.com/files/c0195998-a64c-4adb-9839-b878645b2167/does_netflix_have_the_secret_life_of_pets_2_on_demand.pdf
    • https://uploads.strikinglycdn.com/files/b236e8d2-3f7d-49d0-89e4-a34b9326bcb2/turijepole.pdf
    • https://uploads.strikinglycdn.com/files/951ba2a7-42e7-4bfa-84f2-508241f6d2b7/nuxupawumebawen.pdf
    • https://uploads.strikinglycdn.com/files/4bc52bf3-6441-4dd6-9baf-64e6bd05d545/muwevisomibax.pdf
    • http://suxudogakol.myartsonline.com/shoprite_bursary_application_form_2020.pdf
    • https://uploads.strikinglycdn.com/files/409eadec-bac8-46b7-95a4-6b768f020705/weweriposunasakaxokum.pdf
    • https://uploads.strikinglycdn.com/files/0dd3213d-616a-4e6c-8f3c-6bab28ccca61/1264181435.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_off000286ad.bin
0eb70a1fe828b04c82236d145822e02f46e20ac1249fbb3b22fe0a51fed8f275
pdf-font-stream PDF embedded font (sfnt) at offset 0x286AD 5280 bytes
font_01_sfnt_off00029876.bin
44ec9f47b91db44f00ca279e2a837e005512ecc6e864bd4bd605b184c558d0a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x29876 11328 bytes