Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee424cf49dcf034…

MALICIOUS

PDF

75.7 KB Created: 2021-03-29 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81aa91750e569e9c83bb9ddb36bf2c8f SHA-1: 93f452db3a6d0b2e466411d21c56ff56cb708a9f SHA-256: bee424cf49dcf034338e3fdf9aea44c91dd93438750eb248952bceb47b27edcf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL 'https://kuzutuzo.ru/123?utm_term=bld+full+form+in+education' suggests a phishing or malware distribution attempt, disguised as an educational form. The presence of multiple external URIs and link farm characteristics further supports this. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/123?utm_term=bld+full+form+in+education
    • https://cdn.sqhk.co/tosilura/Qhddlhe/tuvanawedadopafelewokas.pdf
    • https://cdn.sqhk.co/dutigimomana/ghaECpe/susexapowa.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/wulipani_sulunigi_figeka_fimifiwev.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/rijowaxisarupivurume.pdf
    • https://cdn.sqhk.co/noloxunipe/gRH2Fjb/toy_soldiers_3d_model.pdf
    • https://bowasizavaxilek.weebly.com/uploads/1/3/4/0/134042597/9860337.pdf
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdf
    • http://pifafixejizigu.scienceontheweb.net/how_long_to_cook_a_25_pound_turkey_in_a_roaster.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuragumok.atwebpages.com/31485956820.pdf
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_e7a24fee28894a8bbc4a919ca2f2b960.pdf?index=true
    • https://s3.amazonaws.com/wudibirewuduto/23918796882.pdf
    • https://uploads.strikinglycdn.com/files/f55a636d-54c4-4992-96ff-a833d065cd08/25143004815.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_4823a14f45084f8f92e4da9eda8d844a.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/37681177088.pdf
    • https://uploads.strikinglycdn.com/files/1de5677c-00d3-4d23-946f-0cd0ed1122e0/oster_personal_blender_cup.pdf
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_4602cab2f9bf4b7991dfbe3ae9f53d30.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6d6005d-8280-4af9-97dd-33c1b43799f4/rifts_world_book_10.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_5d8c6484f4ba45eb86e614d8bfe13259.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_dc031f10f9d4441aaf58cefc984f638d.pdf?index=true
    • https://s3.amazonaws.com/wixatax/vumuvosojupelowoketon.pdf
    • https://s3.amazonaws.com/ropuba/pelco_spectra_iv_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/01a4f607-3aa4-4642-a371-f85d61b73e82/puzonanidi.pdf
    • https://uploads.strikinglycdn.com/files/463a6fcb-d976-4bfd-be3b-56ae9f9c63c1/bijogadisakanunela.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_off0000e9a5.bin
02fee931f0e882599cb41fbe1cdd81c26b852869c5b31a8e23997271fef7fb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 5036 bytes
font_01_sfnt_off0000fab0.bin
8d59daab1a238bb61da06ef2a0d0b91396982dd9945f7caca502a8edf9a96d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 11504 bytes

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