Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a8dc07a067838d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-21 06:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4bfaec765ebbe4a1a1eccc5c24e1916 SHA-1: 74d2a8ff983db6ba287a2eddb604495192930e43 SHA-256: e5a8dc07a067838da92a75e86fe2245214cd82b9d6ffe6101e412c56e247e5a5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a phishing lure. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs, including one pointing to zajinet.ru, suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=which+app+is+best+for+learning+korean
    • https://cdn-cms.f-static.net/uploads/4419198/normal_603f42bca51b4.pdf
    • http://metoxegid.mygamesonline.org/sadurifob.pdf
    • https://cdn-cms.f-static.net/uploads/4446643/normal_603fce4f5ac40.pdf
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fdc579663273.pdf
    • https://static.s123-cdn-static.com/uploads/4412181/normal_5ffd7e484bd77.pdf
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/8e5df873.pdf
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/9924658.pdf
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5ff66abbba4bc.pdf
    • https://cdn-cms.f-static.net/uploads/4389095/normal_6056b67027de3.pdf
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/lavajexisojefo.pdf
    • https://cdn-cms.f-static.net/uploads/4475863/normal_600aea6feb6ec.pdf
    • https://lonoguvuxa.weebly.com/uploads/1/3/5/3/135320471/84c53309.pdf
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/7530d5a.pdf
    • https://static.s123-cdn-static.com/uploads/4379616/normal_60089b5fb4d7b.pdf
    • http://forisawidokomor.sportsontheweb.net/desifiw.pdf
    • https://cdn-cms.f-static.net/uploads/4454575/normal_60226dfdd1aca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_90fcc732dd234f6dbe760f7d0e1f9d6c.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_10e502da789048bb973176302202f3b3.pdf?index=true
    • http://sasukagisodubex.onlinewebshop.net/54829960467.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_359e32998edf400facaefe06f68ce065.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_49345ab13f764da29e6c51486df5c1fc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ad.bin
1009b7909a68dd040746b3d7427e613464eab445a9faa9c40739d4e9b5267463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AD 5280 bytes
font_01_sfnt_off0000f69d.bin
0d07e214d64f4c74357bf61dca844220a600bd24c44977c91dd5061bab93ee98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10664 bytes
font_02_sfnt_off00011b26.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 4324 bytes

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