Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed6397a59db33e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 09:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e00535e2e442f9098b27f4ed7bda8b15 SHA-1: 97e3de25e4a95207ba7fa7014dcebf89d0d333c5 SHA-256: 91ed6397a59db33eb755076025c1a7ec26cb21291cba9bb285639fcedfebce98
166 Risk Score

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. It uses a password-protected-archive lure. 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 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/wix?keyword=internet+safety+games+for+elementary+students PDF link annotation
    • https://cdn.sqhk.co/towevefizub/BshbKhc/jaruzenuxemujibaxavijivu.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/behold_your_mother_catholic_answers.pdfIn PDF document text
    • http://xekokikimelaf.iblogger.org/pefuwap.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/65875850356iu0v8.pdfIn PDF document text
    • http://susurrus.space/nibuferarozeglp03s.pdfIn PDF document text
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/8747456.pdfIn PDF document text
    • http://dutov.org/35337216388bnsyn.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/R67RUVt/ding_employee_app.pdfIn PDF document text
    • http://onlinekartiadesi.com/what_is_the_price_of_sub_zero_fridgezzmcl.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/iegMjd5/29069089951.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/4213257.pdfIn PDF document text
    • https://cdn.sqhk.co/dulunukosep/6yHUgfG/63199370118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_7bf05444398b44a1ae973dfbec179c58.pdf?index=trueIn PDF document text
    • http://zapizuw.rf.gd/fulewowapum.pdfIn PDF document text
    • http://kerakuwopimarin.epizy.com/konakij.pdfIn PDF document text
    • http://tifixiropu.rf.gd/aparato_digestivo_veterinaria.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_80bc23a480a944649cafb7cc3bc13ed0.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_9bfc5c253db84d0fa1ad0a581bedeb0d.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_8b68a729830d4dd29a6b36aaab208417.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_ddf9d345665a47e1b7b5c95afb71ec4f.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5264 bytes
SHA-256: e587ae564af2b82164f6870384d5adce22a6fa8614c7caa17d3d6a29bce7741e
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 10492 bytes
SHA-256: 54c281d346087466e1634c943c1695ba1a08da69e3c974f4e456a1d215848aa1

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