Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb9f0f8f7eee615…

MALICIOUS

PDF

79.6 KB Created: 2021-03-31 18:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f2f467be2d4417cc6fc798f7a2ede8bf SHA-1: 81693ce7ea1619b1123220280d28570eb777fae2 SHA-256: 0bb9f0f8f7eee615cb89e8ec28a94fb07476123b348cc840d7488757e421296d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan variant. The document body, though heavily obfuscated, contains references to 'Casablanca ceiling fan repair manual' and is associated with numerous external URLs, many of which are on disposable hosting. This suggests a phishing or social engineering attack aiming to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=casablanca+ceiling+fan+repair+manual PDF link annotation
    • https://cdn.sqhk.co/rivitovolu/g8gc7LT/cube_life_island_survival_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603862753d146.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/cambridge_checkpoint_english_student_book_2_free_download.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/how_to_get_fl_studio_cheaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_601a1bfab4351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_60405fb27f806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_601ef1ec52025.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/ifxjeSN/66206033094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_600fb588a150f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374979/normal_5fdea93d366ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383699/normal_600630f6b15ad.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/cancer_de_mama_elsevier.pdfIn PDF document text
    • http://desokore.medianewsonline.com/befuvupenupive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5ffb2e432d0c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_1f023529bf384765b0c543ea606f2b44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagoba/khadya_sathi_form.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_76e32e10a0104d1b9983ae711f1bcb4c.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/72594746456.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/geometry_terms_worksheet_matching.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/compostos_biodegradveis_e_no_biodegradveis.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_8522779f05dc438aa6231219f0b7b6c5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 5380 bytes
SHA-256: e07aa04e795e8e32249132edf7a31f19eae0076bade151e76e5eaa1d7769478d
font_01_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 10748 bytes
SHA-256: b00d2630d961eea89701da9c1531f02a4ecd27c8867feef1f49b278e2f22d5c2

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