Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a7c1807ea96fb1…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 04:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c49ae1e3f8bae1142931d40bc9b2616c SHA-1: 5aa732c944bb0d38418a1cefe1a6594c8fe54590 SHA-256: 23a7c1807ea96fb1976657bb10096c981ae0aa01a2001bfca70b83de0a9d55f1
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 0.9997

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=uh+manoa+transfer+database PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505699/normal_601af55ee42cf.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/ghjngiS/29812370259.pdfIn PDF document text
    • http://coupons2020.info/songs_in_phantom_of_the_opera_movie1076w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_601b61d38440d.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/jjigA7f/52633945547.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/qjjieja/brain_training_switch_uscita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5fd185a3f1e7a.pdfIn PDF document text
    • http://ek-arenda.ru/aragorn_mobile_wallpaperx8lh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_600b3a3f5f7a4.pdfIn PDF document text
    • http://like-store.site/84029578922ksdzz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_600a60428dce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_604ab9c0d0778.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/1fhiJU2/costumes_for_couples_easy.pdfIn PDF document text
    • http://palitra-cveta.ru/dyson_ball_animal_2_replacement_partstyk5y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_789d80ce5164437f8fa0719bd464ca66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/sivutefisivunuwefevuvop.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/guberazazax.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/69849913602.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_6ee24980a750428482971827b817a938.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_9f4cb22a16be4aefba081c11710ea72b.pdf?index=trueIn PDF document text
    • https://e518440a-9440-458f-9a08-48a017ad8d08.filesusr.com/ugd/bca722_9ebdc4d7d30342b7810799acf150a70e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/blufftitler_templates_free.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_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 5248 bytes
SHA-256: 6c5098a8c54be07bd175c72c83ae50f861b982625fd8140717c9bff54c0e64c1
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 11784 bytes
SHA-256: 2ea085765a8eddb5178d532d6f61d7a4ed7c1e5c7c68f2c1c687e0f3f8e5d711

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