Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd15e0f5c60c235…

MALICIOUS

PDF

75.5 KB Created: 2021-04-01 12:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 420bdaf6dca20ab31ee19c04868655f7 SHA-1: 87b389675f56754776246cdeb658a987fe3cb197 SHA-256: bdd15e0f5c60c235be3d49dbc333cf978b1cdb00a3e320836cd397e29392fe4b
126 Risk Score

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://jottigo.ru/wix?keyword=2007+hyundai+sonata+repair+manual+free+download PDF link annotation
    • http://juwupexutaval.mywebcommunity.org/18666700135.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/PoLiihe/mamafimakalivebulo.pdfIn PDF document text
    • http://mugedly.xyz/biografa_de_grandes_cristianos_descargarrxrnf.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/12278829749.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/bZhdafw/monster_craft_kindergarten.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/zixitikekalupipenukaluzod.pdfIn PDF document text
    • http://jushq.club/amacsoft_password_crackerkl1xr.pdfIn PDF document text
    • http://aycotoro5.xyz/icon_and_iconoclast_reading_answersr6ian.pdfIn PDF document text
    • http://stroiline74.ru/49144124580bzdmp.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/blob_type_javascript.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/dabivozapet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_621575d9bb6c4e61bc1c8b1b428b4d25.pdf?index=trueIn PDF document text
    • https://5c233078-9e19-48bc-87a9-1181e95c10fd.filesusr.com/ugd/e3c460_f778f22fa3d44a14991373c90e45234f.pdf?index=trueIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_b844100daa2a468e840c52b2a7c96e88.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_51efa68954374fce8586a020aee41ffa.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_6edf5f34cb1341669e0995500ff94ac3.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_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 5732 bytes
SHA-256: 8cedf83093e741444346ecbd69977f7604b15c1e18a5be9f1af509c702cd4a1e
font_01_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 10568 bytes
SHA-256: 183f98d01cf10b07997ed44dd5c22cdf2443a2af64042f917c0c86017b74d651

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