Malicious PDF — malware analysis report

Static analysis result for SHA-256 28850bdd1d4e9934…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 02:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b4c763a42d0bb0e778ebe1f09c90d52 SHA-1: d458157c04df1eb6d8261f4fbbbc934d3e4b5a20 SHA-256: 28850bdd1d4e99346c75e999755ca715bd224a945c5864c2055440b1b3323df5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=apple+marketing+plan+ppt
    • http://milanomodaitaly.site/salotroi75.pdf
    • https://cdn-cms.f-static.net/uploads/4384039/normal_601783356ad30.pdf
    • http://shoop-fm.ru/noxame74vqu.pdf
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/0523fa1f.pdf
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/wukilomujon_fabogutur_zijabis_gamijadebowozo.pdf
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/b9c6d8.pdf
    • http://ar-foto.art/the_crown_season_1_castww28m.pdf
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5ffe1034cc6c0.pdf
    • http://sdfafq.info/what_size_screws_to_mount_vizio_tvjdew9.pdf
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5fd18e199f514.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c611304-bc8a-4cd7-8c80-6281f4db6738/18349103840.pdf
    • https://uploads.strikinglycdn.com/files/1d747b89-ec7b-49ac-b607-7a7ebc4fb8c1/cloud_computing_salary.pdf
    • https://uploads.strikinglycdn.com/files/c36af389-0e10-4fe2-9fcd-6a495a78ffa7/sapazipimojilapale.pdf
    • https://uploads.strikinglycdn.com/files/8f4d4cc8-e716-4cab-931a-8c0798224acd/42496715477.pdf
    • https://uploads.strikinglycdn.com/files/f6ba77b5-d39c-4e76-bc99-20a922427661/bomutajowaz.pdf
    • https://uploads.strikinglycdn.com/files/01b9c48a-aca6-4c26-9d1e-f5dd094ed554/what_is_the_default_login_for_technicolor_router.pdf
    • https://uploads.strikinglycdn.com/files/76d8a1f8-79b8-46a8-bc80-506a3bad712a/rujeligozoge.pdf
    • https://uploads.strikinglycdn.com/files/a961deed-f83e-44e7-a7ab-7385ee161044/16125523393.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fe.bin
2c4781fab423886418890c924cc3032ffb4bcab4c57b0c568f35842dbafc135b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5012 bytes
font_01_sfnt_off0000f7f8.bin
160d4077759284772229d97dc497d3d2fdc75c6c1ecf71d07e78b64b5f7a66fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 10416 bytes

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