Malicious PDF — malware analysis report

Static analysis result for SHA-256 52111728edf5ba35…

MALICIOUS

PDF

79.0 KB Created: 2021-05-25 13:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4f4da580adbb09860e4338ee235b5cd9 SHA-1: e30bdbbb3508f5060620c1a16d7dedd207427967 SHA-256: 52111728edf5ba3532f53e53b07de84f9211a7c0d2bcf41afd05383417d2f175
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to disguise malicious URLs. The primary malicious URL, https://resalured.ru/strik?utm_term=pdf+editor+software+free+download+for+windows+10+64+bit+with+crack, is presented as a download for PDF editing software, a common social engineering lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=pdf+editor+software+free+download+for+windows+10+64+bit+with+crack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481539/normal_60167e2883b5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469827/normal_6006666431484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_6036b2e8939cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_606e1467d1f9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451556/normal_603551dd5fa5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_60525be2c4305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fee46d879749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fee02f9270cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_6035186c582e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_603fe87b136c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459792/normal_5fed993443e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_606d0f59a1722.pdfIn PDF document text
    • https://gozenanojive.weebly.com/uploads/1/3/4/7/134747079/mujipuk-wezasug-belodib.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/dusajipopuxudiniku.pdfIn PDF document text
    • https://lopazilavorelid.weebly.com/uploads/1/3/4/0/134097689/divizetonibanileb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_604a77f079b36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5ffe456d9a937.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/fajetufekejo/63916590394.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/jevotarupuzifebaxadebu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 2960 bytes
SHA-256: 9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 5840 bytes
SHA-256: 4a7c9be7d807351b72c793289080562ee6e84690c19c1a27a9be78832c7298aa
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10816 bytes
SHA-256: 572d853693d22d3c3a28e93ecdf5a731ec6780e6baa47a5a097717d7de7512f0

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