Malicious PDF — malware analysis report

Static analysis result for SHA-256 856e01fca83c21d7…

MALICIOUS

PDF

70.0 KB Created: 2020-11-21 03:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 39871cb039850ead5e7d3424662483a1 SHA-1: d370fadd5961752d01322c182ae07525f667c7d4 SHA-256: 856e01fca83c21d7a3d598743579f395ee1be0c91d3d9fd7b37c505402b1fe2b
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 0.9997

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=helene+hadsell+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f87433131678.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/monirafulowafix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5fb80db539229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6aa6f22-e69e-4ab8-b37d-7bc2b21e95fa/mobowesexifiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0f5664-3f98-4fb0-abba-7a8986bc25f2/unblocked_balloon_tower_defense_5_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb253815-e1db-410d-904c-a7c18a9bd676/59641545246.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/zojupunegejapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e37acf-d855-4249-957e-cbadf6cc22d0/ruxuxofulo.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/zapedalet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6094a7-c7c4-4538-ab81-d0105d853aaa/segolabagonos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b247e99-6f5e-4e08-8d6f-3dd0eabac2be/wunobavemafekewefabip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9600c102-da21-4358-9fd3-3d992d023f77/content_process_product_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/011b6a33-5d88-4e58-92c8-bfa157056617/vavenafatimilug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e80bee0-2892-4b43-a76e-df95f13738e7/88349836029.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 4992 bytes
SHA-256: 4380942c9c25507c45d899e7d7c76d70dcaa8c84aa16438c5316766abd946151
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 11140 bytes
SHA-256: 775df405311299b019a3c93f4590bd95f786a741c37cae128807ee556c182587

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