Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35346c26897d7df…

MALICIOUS

PDF

80.8 KB Created: 2021-01-08 04:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 829fd0abcad29240e2c26b302e3b6199 SHA-1: a5823ac48798fc6a21d116d1001be5379ea09ef4 SHA-256: e35346c26897d7df96b49672c38dd9e54a3439133994bfc356451d340861b2f6
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing or link farm attack. It contains a large number of embedded links, including one pointing to a known malicious redirector at `https://gettraff.ru/123?utm_term=whats+the+green+skin+vaxei+uses+for+hd`. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=whats+the+green+skin+vaxei+uses+for+hd
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/39258.pdf
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/99ff4b7bb36f.pdf
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fe64b193ac99.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f8aec8a95123.pdf
    • https://cdn.sqhk.co/fawabanof/hi6jhjd/sweet_garden_blast_puzzle_game.pdf
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff48c3daa1c9.pdf
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ff478447e9bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c76169c0-a9e3-4590-a407-864c35d3d2f0/29848431652.pdf
    • https://uploads.strikinglycdn.com/files/74be03f7-f8e6-4787-813d-3eed59f0a0ad/wekovosefakekutuxeladez.pdf
    • https://uploads.strikinglycdn.com/files/df4d3113-ebf2-4885-ad29-3f4ff92a05d2/advertising_sales_jobs_london.pdf
    • https://uploads.strikinglycdn.com/files/d9221af2-59a1-4632-ad6b-74d104d8a008/demexexufofezowuz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0f.bin
4aff4c75f3a76a63ade858f4385a9f125f992cd00f38ac8f9b68340a8dc41ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 5408 bytes
font_01_sfnt_off0000f0cc.bin
c0defe0c5b0ce51ae21c50cb86625d84257970efe1de4ae9048b967b5a18a423		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 5344 bytes
font_02_sfnt_off00010300.bin
05c1206e6e9378165d441d1cf51531aa3db0d2ebb2823d90f895df039425381f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 2424 bytes
font_03_sfnt_off00010dbb.bin
16089c2f7455e47441e22cafc26a990f535a724f1fcd1ff562cdc2d33554576d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 11732 bytes

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