Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f09e2f1c655e4c0…

MALICIOUS

PDF

73.0 KB Created: 2021-03-07 18:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f8a503324d174da7489306f473700a65 SHA-1: 98611079545049073382158275a54a9bac368d00 SHA-256: 9f09e2f1c655e4c01e3d89d22afe9b4a3e76c99cbfc6e9087a5229104925a876
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=lord+jashin+otsutsuki PDF link annotation
    • http://kigurumi.org/7707193151464ssz.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/tK1giJh/27431965589.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/c7ihpgg/vocabulary_builder_activity_early_china_content_vocabulary.pdfIn PDF document text
    • http://usacreditmonitoring.info/2018_forester_mpgtu0wo.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/nOaiihj/tozozedijowataxiloban.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472753/normal_5febc0eae67c3.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/examples_of_answered_prayers_in_the_biblexdofs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_602b2c5d6e05b.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/gg4RgeW/dell_p2419h_monitor_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/NjhUgeA/59080293895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_603d0108c3017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_ac8a6bc34b5e4b6d92280743388c1dd6.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_3a6a8a802e22495fbe881920068b3738.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/44019927803.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/corrugated_concrete_roof_sheets_asbestos.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_b6b9a2ea60b74e8797e0afee2488862e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/worksheet_works_print_handwriting_practice.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 5832 bytes
SHA-256: 0ef65e38f14ee80b492e29e2d61321d800778bfda1cebb2d3ceb2cdaeddcc335
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 4960 bytes
SHA-256: e8703a0924a54091050da543901756988dcf5e5e9c31483b3bff2ef537aff6fa
font_02_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 9856 bytes
SHA-256: e7a8e5916668f5d6e0a5f37de3840c8462c814cf1c74e24dcd78436b3b270a72

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