Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdc4ee0ddc903f8…

MALICIOUS

PDF

116.1 KB Created: 2020-11-24 02:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0c0dae85363c0f456ddd67e242ad2ca SHA-1: 7698d0dfff3007d299132aac31434bf3fa050099 SHA-256: ccdc4ee0ddc903f88551539c7a03ede2de178114d24c8cfdcda897a27d3c61c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or redirection scheme. The embedded URL `https://traffine.ru/strik?utm_term=%25D9%2585%25D8%25B9%25D8%25AF%25D8%25A7%25D8%25AA+%25D8%25B7%25D9%258A%25D8%25B1%25D8%25A7%25D9%2586+%25D8%25A7%25D9%2584%25D9%2586%25D8%25AC%25D8%25A7%25D8%25A9` is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/strik?utm_term=%25D9%2585%25D8%25B9%25D8%25AF%25D8%25A7%25D8%25AA+%25D8%25B7%25D9%258A%25D8%25B1%25D8%25A7%25D9%2586+%25D8%25A7%25D9%2584%25D9%2586%25D8%25AC%25D8%25A7%25D8%25A9
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fb45ba4ec140.pdf
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/denesanijibep.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/9923756.pdf
    • https://cdn-cms.f-static.net/uploads/4490519/normal_5fb7248577701.pdf
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f9356f03ad6c.pdf
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/vebefamuzibenoxuki.pdf
    • https://cdn-cms.f-static.net/uploads/4490127/normal_5fb295090daa8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/693cdc2c-e54a-439e-97b8-6670b8ea2cf3/kudabudalakibivodukuv.pdf
    • https://s3.amazonaws.com/rokuwapesu/dolabewosinewutimi.pdf
    • https://s3.amazonaws.com/dogazisuze/ly_hnh_nh_t_file_online.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/jutijifimebopaxumaloj.pdf
    • https://s3.amazonaws.com/xamibudasagas/carmilla_espaol_completo_gratis.pdf
    • https://s3.amazonaws.com/memul/savawodulude.pdf
    • https://s3.amazonaws.com/potevip/50055879203.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018761.bin
286e481dd8a8a390511bac811ea770f0ad3399a7edd2edb6c702d4f1da62b392		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18761 32800 bytes
font_00_sfnt_off00013b0f.bin
8e72149c7ce3095aec9cecc072f8a515df207c00aebf785f12c4fc197e954f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0F 4068 bytes
font_01_sfnt_off000148ef.bin
faea3b72a27160b9c920e09b45fb0efd6a020788b3aac56b9e2bee719d2c7519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148EF 10896 bytes
font_02_sfnt_off00016d01.bin
88ae535f4b3fa9af98e9d913c302d0f4aa0ebaf25a1f1719f422aa9aa0211b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D01 17552 bytes

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