Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cbcf130a6847a6…

MALICIOUS

PDF

74.2 KB Created: 2021-01-18 11:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f745f53994d5296e3572b22df13641e5 SHA-1: b880f31931715e804b3abb5cd4a7ad4e98c6b851 SHA-256: 61cbcf130a6847a6313a579fced77841a43fc2444b9afbd0f6b873a5123e7a2e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to 'vertebrates and invertebrates worksheets for grade 3 pdf', suggesting a lure to disguise the malicious intent. The presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to redirect users to malicious sites.

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://leonvi.ru/123?utm_term=vertebrates+and+invertebrates+worksheets+for+grade+3+pdf PDF link annotation
    • http://xapakemulu.22web.org/xudowajafufubusike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f91bd771348b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f93dca2e4c6a.pdfIn PDF document text
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/4037721.pdfIn PDF document text
    • https://site-1168129.mozfiles.com/files/1168129/dozupawo.pdfIn PDF document text
    • https://site-1175656.mozfiles.com/files/1175656/business_process_management_practical_guidelines_to_successful_implementations.pdfIn PDF document text
    • https://site-1257583.mozfiles.com/files/1257583/penobimoponomilale.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/rubufawedefe.pdfIn PDF document text
    • https://site-1175753.mozfiles.com/files/1175753/38590738587.pdfIn PDF document text
    • https://site-1173610.mozfiles.com/files/1173610/67556923048.pdfIn PDF document text
    • https://pisawaramas.weebly.com/uploads/1/3/4/6/134685908/ruvejen_pajemepoxikik_rerovetilov_xidefubow.pdfIn PDF document text
    • https://site-1178489.mozfiles.com/files/1178489/ping_pong_masters_mod_apk_1__1__44.pdfIn PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/775da8429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/wudateramugarala.pdfIn PDF document text
    • http://nowuzapifara.rf.gd/alfresco_community_link.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/89610774911.pdfIn PDF document text
    • http://safefimij.epizy.com/distributor_company_profile_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/aasld_guidelines_portal_vein_thrombosis.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/statement_of_assets_and_liabilities_form_sbi.pdfIn PDF document text
    • http://gadusevi.rf.gd/21085431043.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 5544 bytes
SHA-256: 16b7215d37920bcc7037e74ed32edc9c684e9f55b20b3ed7fc968ef3fbefb751
font_01_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10352 bytes
SHA-256: 3457c9012fdeb7e8dc02dcc889aca5b26b6f0731780b5344c773bb22cd9a21ad
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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