Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad39652e01b4379e…

MALICIOUS

PDF

66.4 KB Created: 2021-03-30 20:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff1b25c6fb6f21ee4c2baff767358a68 SHA-1: b1f50ba22dc200f8db937b10f42319721964c3d9 SHA-256: ad39652e01b4379e49d7e65814cd5352d217848ea0575c936847c38fd9d12be1
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/123?utm_term=alcatel+lucent+ip+touch+4038+manual+espa%25C3%25B1ol PDF link annotation
    • http://trokot-newshop.online/nj_transit_bus_freehold_to_nycc4bnh.pdfIn PDF document text
    • http://organicnu.info/kivawesefue03xt.pdfIn PDF document text
    • http://moscowflowers.shop/sql_queries_examplesfkp9b.pdfIn PDF document text
    • http://weraka.online/71380495486sqcc1.pdfIn PDF document text
    • http://lasleymarkt.ru/bolezazonalopinamufejnl8l.pdfIn PDF document text
    • http://mon-compte-cmb.best/jogunodenozurafacr9xk.pdfIn PDF document text
    • http://kkkirrreeee.space/39386528656umbdn.pdfIn PDF document text
    • http://reduslim-europa.site/21897028024vwloe.pdfIn PDF document text
    • http://picply.ru/what_are_the_different_types_of_tones_in_poetryr25v1.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/new_oecd_guidelines_transfer_pricingbmrjf.pdfIn PDF document text
    • http://yblda.fun/guru_granth_sahib_meaningmb9ht.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_e74b568beae04e5084aa44d3e7cbfad6.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_753e8c6d4ab4480596454643dd73dd90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b3fcba-d989-443d-ad73-96180b8e1128/kekutuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b128ccd-cfd8-42f9-aa57-7b9aafae0d8a/agile_project_management_certification_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4008e4d-5a36-467b-8c1d-36bd379629e3/pafaxun.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_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 5868 bytes
SHA-256: 8b163d44e2c9c1ada3d37a3a5297e4b569c84030731ae5998b0e4a981947f87c
font_01_sfnt_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 10408 bytes
SHA-256: ee656285ed607fb3114c8398f8cd3a23c3940e446e2ec6e069f483022fa161f9

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