Malicious PDF — malware analysis report

Static analysis result for SHA-256 925cbb87c602662f…

MALICIOUS

PDF

91.0 KB Created: 2021-04-07 00:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f243746562af3dbb9e34d32218032e31 SHA-1: e40266d96ca5c07d70e3b19366e1b279ce81739b SHA-256: 925cbb87c602662f237c37fadb3539706a0caba72e4fe9822bb4f0bb037a1c2c
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 0.9996

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://kuzutuzo.ru/123?utm_term=ayushman+bharat+yojana+ka+form PDF link annotation
    • http://vash-fasad.live/gibuwulakifmp3er.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/siyavula_physical_science_grade_11.pdfIn PDF document text
    • http://montana-media.com/spelling_bee_word_list_for_10th_grade5xprd.pdfIn PDF document text
    • http://fonixeguga.mywebcommunity.org/48974953007.pdfIn PDF document text
    • https://xufanipup.weebly.com/uploads/1/3/1/8/131856619/xupafafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_6036c14bd594c.pdfIn PDF document text
    • https://sisivijujejaliw.weebly.com/uploads/1/3/2/7/132741673/6045030.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/11423536160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_6023ac50bd9ef.pdfIn PDF document text
    • http://golosa-spasibo.ru/xiser964lb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fd7da05e5544.pdfIn PDF document text
    • https://viwukafum.weebly.com/uploads/1/3/0/7/130738591/xewegaxowuvatopiraz.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/9269756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/gudukupir/tewafo.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/scala_rider_packtalk_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e94c14-1355-44a8-9bc1-ff5abac14f26/kiwejekofigonunaxo.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/zirujerotar.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/kibajusadixuvab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66c84d3-2c15-46c9-a47c-056ccf6d055d/how_much_does_a_supply_chain_manager_earn.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 5348 bytes
SHA-256: 88c9ae199278de29627119ce15adbdd92324d640e8bd32903049a0bfd40eff2b
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 11108 bytes
SHA-256: 4a967dbb222772b0db633fef7bdba7c4f778ea8b60e903fa5334204c37d34d7c
font_02_sfnt_off0001330f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330F 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
font_03_sfnt_off00014860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14860 6188 bytes
SHA-256: 4a6de903472567f36eba1ffcaa61d36657bab963151f1184183277f89490031d

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