Malicious PDF — malware analysis report

Static analysis result for SHA-256 417ea92617087ae5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 05:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1481ae72686a6a176f50911a5a7500e2 SHA-1: 191fc835122f981208b98cd76fd7281318bb75af SHA-256: 417ea92617087ae54a93d710a16c6393885e656b2beb581f28a4ac7376b69666
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack pattern, likely leading to further compromise via external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=after+billion+trillion PDF link annotation
    • http://srividyaastrology.com/userfiles/file/63398726340.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/47785937732.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/ropojerirowe.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/46806195612.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130454c0d37b---venererimifoxej.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/52963036828.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/mipovezapatagunob.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/25130278245.pdfIn PDF document text
    • http://sayarbobinaj.com/file/96029358061.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/lafow.pdfIn PDF document text
    • http://polletnv.be/uploads/files/66782417097.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/63538023492.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136270997470---34464618707.pdfIn PDF document text
    • https://huanghecables.com/d/files/44113377570.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/lanovowilatexanupov.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/43266275623.pdfIn PDF document text
    • http://airfa.it/userfiles/file/24813111466.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/towujaredi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/33055419983.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/jodasesogokitekij.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/jatukuguluw.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/rawixo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 10000 bytes
SHA-256: 17f26de2559671636f8481aadb5da6cc7ef087d3e3e01c129d20d6869836e72e
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 18492 bytes
SHA-256: a8613604994e682f3a0312b41d5a44567d74fdd707d808a804911026148b7454
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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