Malicious PDF — malware analysis report

Static analysis result for SHA-256 049f0487f53dd0ab…

MALICIOUS

PDF

80.1 KB Created: 2021-02-24 21:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de61baaace0edd8d452228b9b3d9052b SHA-1: 99c824aeeaf6b53a1901221f2a97241301a8dcab SHA-256: 049f0487f53dd0abd847882e8f6fc6bc647625e2620ffec6df62eba6b4926a4d
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://druttle.ru/strik?utm_term=restore+dell+to+factory+settings+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fc59b558d5e3.pdfIn PDF document text
    • http://thestablestl.com/pirowasedafinuvemebamuver800l1.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/zisewaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/njijfig/craft_pocket_3d_apk_mod_gems.pdfIn PDF document text
    • http://arnautmebel.ru/lowizvcaek.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/QqXjgs2/57708799305.pdfIn PDF document text
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/visofinetowagi.pdfIn PDF document text
    • http://nijibegosovatiz.iblogger.org/riwowinilanoritegetiwopo.pdfIn PDF document text
    • http://3gusevshop.space/kozevukivudotibofiweko1fgt2.pdfIn PDF document text
    • http://wolotalute.iblogger.org/landscape_ecology_journal_guidelines.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/service_canada_employment_insurance_report.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/piroz.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/hhjgdN2/xikutewikeriwebugenip.pdfIn PDF document text
    • https://cdn.sqhk.co/balemarize/jbToVCA/extreme_racers_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vovigewuva/eVdwr8D/dual_space_64_bit_support_gg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekoraxevab.rf.gd/juki_lbh_780_manual.pdfIn PDF document text
    • http://pekijokedod.rf.gd/waritiwetisumigexodope.pdfIn PDF document text
    • http://sapifux.epizy.com/25937466120.pdfIn PDF document text
    • http://tajarajizuwoso.rf.gd/wadumerolimu.pdfIn PDF document text
    • http://kedekivotizera.epizy.com/realidades_2_capitulo_1a_answers_pg_13.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_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 5584 bytes
SHA-256: 9a76cf2e7e2b6cc1d3c2fbe809da74d3c4b7a34c0c27c1c7f44bf32922d00f9a
font_01_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 11616 bytes
SHA-256: 22d68334f884e1d1a2ca41710b7059fe292dafe39a5b48fd13fcf11a51632f69

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