Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82d2b26483287e8…

MALICIOUS

PDF

64.8 KB Created: 2020-12-09 20:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 511df1fc2b1dda736a4d3cc164dc232f SHA-1: 926b1f315cdc1ff1a5f8d8835a65b642f0ebf2ef SHA-256: c82d2b26483287e86e1c3a40029698c2f1d1175164c4319bd8885a87c837bd39
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 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.
  • 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://traffnew.ru/123?utm_term=naming+amines+practice+worksheet+with+answers PDF link annotation
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/2cc3c056dd7b9f3.pdfIn PDF document text
    • https://kimidagox.weebly.com/uploads/1/3/4/4/134470984/fotisis.pdfIn PDF document text
    • https://vuxofuta.weebly.com/uploads/1/3/4/2/134235669/fapupunukojoxem_sixugaponap_mubido_notumigelax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf492a61e25426e12e9dfc/1606371626438/80031265183.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2bb5d11f6a41984918bba/t/5fcb97ada51c5a1401ac9629/1607178158922/dead_trigger_2_download_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf547a3f75b16643cc03a8/1606374522775/vuzulikasovuxuzatinupifem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57a2a1452f90b7f03fee5/t/5fcd0a94fe657040d595c585/1607273115074/9815671384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71a2afc-fad5-4d6b-af9d-bb15111c35e5/90074435341.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc1bf0764571256547d8015/1606532871604/how_great_thou_art_chords_d.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe17593c02f22b9dd56d49/1606293337909/pikiwusakexibixebadufa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66db9a8793968642e0201/t/5fc9f708887b444c615a3daf/1607071497019/noweka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58414a3bf4b14abc861b4/t/5fc780f42ac13f1ee9bd4bef/1606910206918/best_free_virus_scanning_software.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d49a16f6d44b07be6b5d/t/5fc3885acb3e0f5771bdadf9/1606649947572/ragipaz.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_off0000bf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF12 5440 bytes
SHA-256: 726549e82a4142f28468fcd5327a4b95aa64bbd01ea787247654b388dc1ef45c
font_01_sfnt_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 10720 bytes
SHA-256: eb7881c12ec45abcc0821594c52de98d6d9f956c38f8426fd4ab0c23120531d6

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