Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf97deb53c189be…

MALICIOUS

PDF

92.8 KB Created: 2020-12-11 04:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43fc7f41eff7e7c0a0205ef5c771e45a SHA-1: 951e4af271fb56dd9e3bd23b2b4954326afcd53a SHA-256: 2cf97deb53c189bed096f242b492008e713a239aa7f3d4cdbb7c1e5a94436947
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 SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary external URL, 'https://traffine.ru/strik?utm_term=google+donkey+kong', suggests a lure related to search engine optimization or phishing. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=google+donkey+kong
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/9651355.pdf
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fa6dbb53a4d5.pdf
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/e301a169f3.pdf
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5fc295c45acc5.pdf
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fb3c5e93922c.pdf
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f957647eb5d0.pdf
    • https://cdn-cms.f-static.net/uploads/4476780/normal_5fd269cfa6126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc7a8f348c1673e559e38e9/t/5fcabbe599bb037aca02825e/1607121893985/pearl_necklace_price_in_hyderabad.pdf
    • https://s3.amazonaws.com/zidenigad/nea_convention_2020.pdf
    • https://s3.amazonaws.com/lewuli/kalimibedunaxaraneter.pdf
    • https://s3.amazonaws.com/lanubili/gefakudijewini.pdf
    • https://s3.amazonaws.com/xakusineba/sheet_metal_gauge_chart_metric.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_006_off00013254.bin
88c2f4fba8e85fea0e49f8b5d0bf7da5b0b1a64d8baba83c4c81e1be62ca76c6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13254 27312 bytes
font_00_sfnt_off0000eb84.bin
aded5c65faff7d5505dc160b37d8e8c5a0174f6cb8d4f512a1f64af0fcdb1d0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 3700 bytes
font_01_sfnt_off0000f8b5.bin
7b5d98112e9292aa6db5689f81e1caef8334014049aeb34c4e56023c7e7ccce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 4704 bytes
font_02_sfnt_off000108dd.bin
b8fad1b83c1c65150dd10c871bc649104737030370d212e8c77a84a7493c7901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 12400 bytes

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