Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a136a6f6803cc0…

MALICIOUS

PDF

83.9 KB Created: 2021-03-28 11:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92e6e7bdd210cc39456965c5a7dc3b1b SHA-1: d64e3675e2fa3ef85fb5744754c6ee8aeb520dd6 SHA-256: f5a136a6f6803cc02a33c2bc70a0e93dd4e334ac18e210a963e6456a7a3809a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

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://botokaw.ru/123?utm_term=salut+d%2527+amour+quartet+sheet+music
    • https://cdn-cms.f-static.net/uploads/4381752/normal_604003a468962.pdf
    • http://taforojujutusig.mygamesonline.org/78261989238.pdf
    • https://cdn-cms.f-static.net/uploads/4372086/normal_6044a07d46a3b.pdf
    • https://cdn-cms.f-static.net/uploads/4468255/normal_6011651100260.pdf
    • https://cdn-cms.f-static.net/uploads/4403131/normal_6037b39d63c67.pdf
    • http://joritirumag.mypressonline.com/78301303865.pdf
    • https://cdn-cms.f-static.net/uploads/4427781/normal_60216ee074329.pdf
    • https://loromosukatilif.weebly.com/uploads/1/3/4/7/134774062/vegufe_xuximu_podonufewuzemo.pdf
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/xolazopisoxuxifura.pdf
    • http://wujejejifi.mygamesonline.org/29821319531.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_6035d780d5f6d.pdf
    • http://xogunajeraxuda.mywebcommunity.org/12609185310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_dfa14305ebdd44aebf6cd6ba292ecd0c.pdf?index=true
    • http://zegetafirotazaz.atwebpages.com/probability_formula_for_3_independent_events.pdf
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_81aa468a69a941e8a6202ab45be94f5d.pdf?index=true
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_1d6294de36b54f53a2153dbf6d62c9be.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4d.bin
1b60f7e6ff162b4f423121091bad02619ed2f4b0b8e0adb31c74610f9df06d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 5444 bytes
font_01_sfnt_off0001019f.bin
64fbfc5aa319fb95dd0c481f85ea516db0bce56186f3e53e5ce18057137bf4cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 12868 bytes
font_02_sfnt_off00012bc7.bin
3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 16096 bytes

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