Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d8764b6e68f375…

MALICIOUS

PDF

77.5 KB Created: 2021-03-15 18:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 642a755b249a1bf7323a6e387eba612b SHA-1: b071d16a4290d410ad491618ec78ae5a78dbf8cb SHA-256: c2d8764b6e68f375a162b53806e6bd5ef95f9fdc76ba821613342b8976240b2f
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 of which are dynamically generated and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The embedded URL 'https://resalured.ru/strik?utm_term=am+i+good+at+everything+quiz' suggests a lure, possibly for a phishing campaign or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://resalured.ru/strik?utm_term=am+i+good+at+everything+quiz
    • https://cdn-cms.f-static.net/uploads/4484990/normal_6014493ed590e.pdf
    • https://static.s123-cdn-static.com/uploads/4386607/normal_6008cd82219bb.pdf
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/3847698.pdf
    • https://static.s123-cdn-static.com/uploads/4452381/normal_6003957758310.pdf
    • https://cdn-cms.f-static.net/uploads/4476429/normal_5fda878076792.pdf
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fe01c232fba2.pdf
    • https://cdn-cms.f-static.net/uploads/4447251/normal_604206d50e801.pdf
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/f1473bee913a.pdf
    • https://static.s123-cdn-static.com/uploads/4476122/normal_5ff248362d6f3.pdf
    • https://cdn-cms.f-static.net/uploads/4368223/normal_600c8f7fe2aab.pdf
    • https://cdn-cms.f-static.net/uploads/4446166/normal_60419cbbe14aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7a060034b3ed46db8cf5a0e61cd5be10.pdf?index=true
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_16cb73af640849f98ff7bb610b14c430.pdf?index=true
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_4345a465d4f0426096c6318c06f95be8.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_23ea316b08ac49c78a0c1791cd9cd49e.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_af327f6472ff435dab1a95d1c12be5f2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec7.bin
97a3f58106315ea4837cc7f351c6cfefa51feae4af9a810f7ed488647bfea552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 5356 bytes
font_01_sfnt_off000100e1.bin
995b9ad212fb3678d9978789dec4e25f5e8b5e9b18127e55849b4e3b9256485b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 11276 bytes

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