Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ae438f33a3e183…

MALICIOUS

PDF

74.5 KB Created: 2021-05-19 08:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77969dbc356f54520602bbe4d021c334 SHA-1: 279f714252ecc10a7910ca5b553b7d71115b5d71 SHA-256: e9ae438f33a3e183e936e2dfb69caf6af1a80d81efac3300206151f90f95b791
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=chirurgie+g%25C3%25A9n%25C3%25A9rale+v%25C3%25A9t%25C3%25A9rinaire+pdf PDF link annotation
    • http://bedusopuzal.22web.org/agrarian_reform_program_officer_duties_and_responsibilities.pdfIn PDF document text
    • http://zakiwejila.iblogger.org/soccer_attacking_drills.pdfIn PDF document text
    • https://geguxawuxereko.weebly.com/uploads/1/3/1/3/131379712/f3e00c766697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_605857c7310a6.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/4019728.pdfIn PDF document text
    • http://fodosokidorakig.22web.org/lajemerumopewutisinonoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_603e182398939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486221/normal_5fd67d786b9d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fc7bbae27977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_60270e801e8b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/game_naruto_online_mmorpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09585f4f-b4e2-47b1-b7b2-bfdfe60f9478/place_value_tens_and_ones_first_grade.pdfIn PDF document text
    • http://pufiwuwa.epizy.com/merge_with_adobe_acrobat_reader_dc.pdfIn PDF document text
    • http://vedisupekak.epizy.com/52582574299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c467362-eaaf-4351-aa16-0fc830b5ebc7/how_to_say_let_us_pray_in_latin.pdfIn PDF document text
    • http://kevusej.epizy.com/factoring_quadratics_worksheet_algebra_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aeaf425-d7ea-44ce-9888-765c50466fa5/is_sao_fatal_bullet_good.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/hayward_salt_cell_operating_temperature.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 5232 bytes
SHA-256: 1520b9d212fd71c2afcb2965c41c619002b44a616808e2963e38ac2af8a7109b
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 12220 bytes
SHA-256: b6e2c3a738e3cd64e749bd806b8333d0cbdfc0665915c2c22ba16cce60113621

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