Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9ee0e222e0a41d…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 07:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 128aeff9c2a81d34196c721f7d67b0c2 SHA-1: f38ce2c559b59d0b0319614bd14e51ffb9a8d96f SHA-256: 3f9ee0e222e0a41d28748575fff742e724362c194862a0837355c88e1e0aed88
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru' which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to stairlift installation, aiming to trick users into visiting the malicious link. No scripts were extracted, but the overall structure and URL usage are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=how+to+install+a+stannah+stairlift
    • http://dressnbuy.com/taxotokvsqi5.pdf
    • https://wujadagepixiv.weebly.com/uploads/1/3/1/8/131856877/1693185.pdf
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/pazelizadedisef-gupozexumasil-sudulodofegizi-jugesevil.pdf
    • https://zoxobafibo.weebly.com/uploads/1/3/4/2/134235835/b54fdcfe6c8c956.pdf
    • http://kerutugizuxig.mygamesonline.org/whats_the_value_of_12.7.pdf
    • http://kifikawi.66ghz.com/juluz.pdf
    • http://mebets.xyz/81679858951k3sd.pdf
    • http://erethiztzj.space/38238749060zuizz.pdf
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/votukeluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0869a838-0905-4226-8f9b-4fb5a59658c9.filesusr.com/ugd/be19e1_4ca87bb6d8bf4366b8c6dc4bc1fcdec0.pdf?index=true
    • http://kisalonokexiwi.atwebpages.com/que_tipos_de_funciones_existen_en_matematicas.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_1f36642b40864c9dadcf52300e8b3c73.pdf?index=true
    • http://semimuwido.epizy.com/22456709161.pdf
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_f81923c25a0940e99e8a57960f0cc59c.pdf?index=true
    • http://furosusuz.epizy.com/how_many_quarts_of_oil_does_a_2005_nissan_murano_take.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_1d41395a2217436899a474ea36e2185d.pdf?index=true
    • http://xejotapawadi.epizy.com/89442934740.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fe.bin
1d3bdfac3e4347285165110f59a670fce4b3d3b6398f91bad189a70812fd7149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 4908 bytes
font_01_sfnt_off0000f5b1.bin
af7037341cf51db30bcb06a3cc8905efdc995be810c8d8f9aaecbdf260860bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 11124 bytes

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