Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bde28f8d8db8ca4…

MALICIOUS

PDF

81.9 KB Created: 2021-05-02 14:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d3528354dc48489942346e39f8c538df SHA-1: fabbec8656176f0e7c7dde4e0b85b18dc03d3b5d SHA-256: 1bde28f8d8db8ca4ca359bc28789ef8e4eb3aa428b9503d2de37f68a85d826ae
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 0.9995

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 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://dafemum.ru/strik?utm_term=neuromancer+william+gibson+amazon PDF link annotation
    • http://allwoman.site/zizujaf0etw.pdfIn PDF document text
    • http://austritkfa.com/rajini_murugan_chella_kutty_song_free_downloadgblw2.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/64998511057.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/weaknesses_of_the_articles_of_confederation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fd32b570e5f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5ff3935866fb0.pdfIn PDF document text
    • http://freds.space/chapter_13_chemistry_testb4jjw.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/89405335268.pdfIn PDF document text
    • http://zahlungsservice-ch.site/fidalojelijimedxcw57.pdfIn PDF document text
    • http://arendagg.xyz/why_does_mgo_have_a_higher_lattice_energy_than_naf12q1j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367290/normal_5fe45ea2d74f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinezedu/67591299570.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_620c49c6f0c140dda12d7c0505e619ae.pdf?index=trueIn PDF document text
    • http://girofili.myartsonline.com/les_adjectifs_numraux_cardinaux_exercices.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/linigogewepeda.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/23957617210.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_b31c5e4bab3f4704ac71b96d27457f49.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_3592bb96cb4d4ca084f8736c3b3bf893.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_b4133a72d7084e81af99552e278400fa.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/22952797318.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/xukivopibode.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/immigrant_song_drum_sheet_music.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_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 5372 bytes
SHA-256: 0ff95aba4e01223c7fb90f0213a34864d422da8a7879495ff45ce9e2d7a930ec
font_01_sfnt_off000115f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 10612 bytes
SHA-256: 50d96e79e34a65cd3d8d8f2c2794af27e991b32c05f9a2a03cb8c106476bb747

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