Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53a493dfa8b32d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-02 20:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eee70f23d99d46060f631eefc518d2d2 SHA-1: d6fb1f5a0b14f82302f26f953f5c8bb356897438 SHA-256: 4c53a493dfa8b32df7113e9c76054416b235b4fd98c488b9190ba3fee882d0f3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to SEO-optimized PDF farms, suggesting a tactic to manipulate search engine results or redirect users to potentially harmful content. The embedded URLs and the document body, though heavily obfuscated, suggest a lure related to product reviews, likely for phishing or spam.

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 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.
  • 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://pelibifir.ru/wix?keyword=samurai+x+pill+review PDF link annotation
    • http://mojivoposo.iblogger.org/lumowazilo.pdfIn PDF document text
    • https://cdn.sqhk.co/tumexifukevu/hipujij/91228752117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_601212d60dded.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/f6c30d15f900.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/aa90fa9.pdfIn PDF document text
    • https://tozilamuvopodes.weebly.com/uploads/1/3/5/9/135966944/7625982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6029205fdb9ff.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/xezapumalup_koriwugo.pdfIn PDF document text
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/mivudikokudak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/pumilitebalozovunarinoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/74229433936.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/vuzunefelutilewibuv.pdfIn PDF document text
    • http://basagumipuzo.epizy.com/41323989367.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/nejaba.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/zufetowezoza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 5112 bytes
SHA-256: 48545bb35d326608475a4f881bbd038f9d73e012af5abc0b88fde9de68123327
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10364 bytes
SHA-256: 60642801a08bc5e002fc4ce198334628d6e952f591712d88b04eba932adb0a48

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