Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8639e7e00a44aa…

MALICIOUS

PDF

75.0 KB Created: 2021-05-16 00:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 55892fdb5c92e4d602d8e0a8f72343be SHA-1: b87e8c3c4d0ae45cd3712007230cbdcecc8b895a SHA-256: 2d8639e7e00a44aa5bdc0dfb9a49a8926f1f0ecc709bc0175d6a4bc88cacb144
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI suggest an attempt to redirect users to malicious or deceptive websites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=focusrite+scarlett+2i4+software+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fce8a38b0cf6.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/faniwuzapunusurefob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_5fe5a62852abd.pdfIn PDF document text
    • https://gomamatugapisum.weebly.com/uploads/1/3/4/3/134392688/zifesufufiw.pdfIn PDF document text
    • https://boxuxavuviw.weebly.com/uploads/1/3/4/7/134716171/rizesapozasiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_606454b586c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_604ce86202a47.pdfIn PDF document text
    • https://sowafumo.weebly.com/uploads/1/3/5/3/135309866/e0565755.pdfIn PDF document text
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/2562557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5fcf51a421c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fd9dde62367c.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/legesiliv/linen_cotton_blend_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/igi_1_direct_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/best_animation_software_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996948f7-9b49-4019-bb43-c6e2ff4fa4da/huskee_riding_lawn_mower_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50ef555-7ef7-4433-a865-846104fcd0a7/oxford_online_esl_placement_test.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/rixitebekusewuden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baba6d14-bb20-470d-ac3f-95f9ada21e76/dbt_skills_group_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/house_finishes_schedule_template.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 5284 bytes
SHA-256: 4aa52de85c11eca9052b0a7d54eebf8c371b3c7cc610b10418c41dc7e5e638ad
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 11556 bytes
SHA-256: 96742d250f4fbaf0afdd87150b22f242eb31c4e743d02ca67c97c92bdb0fa3fb

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