Malicious PDF — malware analysis report

Static analysis result for SHA-256 407cf096d329d8bf…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 09:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eb0e7be19644e5252696d8239eed4b54 SHA-1: cd7b2c8dae3ab85d859b5e5032c35e6b6280d731 SHA-256: 407cf096d329d8bfa898d438c5c1093ba4fedce17a6d01b0e0bbc348af4564ce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=household+budget+spreadsheet+printable PDF link annotation
    • http://italy-small.space/xosinonelipujoxudulywmgp.pdfIn PDF document text
    • https://rovalexi.weebly.com/uploads/1/3/4/5/134598456/sutajumalo.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/4594352.pdfIn PDF document text
    • http://craftsmansmetics.com/ejercicios_resueltos_operaciones_com5adh5.pdfIn PDF document text
    • http://optamorem.com/fuvexazoxapizavuveteqel21.pdfIn PDF document text
    • http://flowerport.market/how_to_rewire_an_ott_floor_lampcbzwa.pdfIn PDF document text
    • http://atelier-spb.com/18618025854ubhxu.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/13259306095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_df8954708a8e448199cbddec8e042902.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_59953a20efc24a09894fe8a283f48908.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/81319129210.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_a24fe7116ef24bedbc6336d25352cd27.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_83e7c6ce01de4367b058de8e3d74755c.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_0330bb7e3b8e42ec8300ced61e4f6b37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ace4173-2930-4177-b9a1-6066592539a7/wd_my_cloud_home_8tb_1-bay_personal_cloud_nas_server.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_ff1bcb7dee824e75815ad87d8cc70ab9.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_d7ff3ad9c4e24876a485b27f94332b32.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_a52909bb023b4ef59dec696b620d2689.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c38584-5ff0-4c73-ad77-132ad7afaf84/44974988324.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5320 bytes
SHA-256: c8d8f36d1804d6e2efeaf5849b374458de1ce30f05f312f69a68551a1163c8c4
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 11292 bytes
SHA-256: 375827b0ae90194e7480363edd89cc684cf91c3d2d4c9aa51bf78ee8eaaec276

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