Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b10943c03487be…

MALICIOUS

PDF

78.4 KB Created: 2021-03-27 11:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a28ba79e62347783562004b24b1f6a48 SHA-1: 981f60b0b0655be394a56f46ba4a990f78706cb1 SHA-256: 08b10943c03487be578d239d19dacf3b27ea642ac2fe3e55a9f4b8bac5b10b16
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 pointing to what appear to be SEO-optimized PDF documents, suggesting a link farm or content manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious or spammy websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=rock+worksheets+for+first+grade
    • https://cdn.sqhk.co/zedugixaka/cBFSroj/84876611255.pdf
    • https://sozawozoxo.weebly.com/uploads/1/3/4/5/134509422/ca71d52f194ba9a.pdf
    • http://matteset-spon.space/424808689542mopz.pdf
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/fisepokemaxopo.pdf
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/kudugafitubifisag.pdf
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/1c1635e9.pdf
    • http://meblik.su/fususedulujado686a4.pdf
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/3088018.pdf
    • https://ginataxidorivez.weebly.com/uploads/1/3/4/0/134041929/4485484.pdf
    • https://cdn.sqhk.co/ruwonumatag/f9Chequ/74578556727.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gofilafixu/fundamentals_of_power_electronics_mcq_download.pdf
    • https://s3.amazonaws.com/gixirojozogufux/when_should_you_read_the_assassins_blade.pdf
    • https://s3.amazonaws.com/dukexajuj/dofideri.pdf
    • https://s3.amazonaws.com/lomuper/gettysburg_pa_weather_report.pdf
    • http://togipabuwaf.epizy.com/20474602123.pdf
    • http://pimibini.epizy.com/ayuntamiento_de_madrid_cursos_formacion.pdf
    • https://s3.amazonaws.com/bulalowisu/cool_riddles_and_the_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb7.bin
35dd4cad6ef26b371d7c596c59e1a7a7f94cf2f933a040f65c96443fa4113e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 5416 bytes
font_01_sfnt_off0000f03a.bin
00ad670798faea405f5de2cc012fb22c8131a9f1717ca0850edaae44a083e69b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 11224 bytes
font_02_sfnt_off000116ad.bin
ca4d581cd4742a0c1c5620a90d55b9dd36e2e515a2362f12d19eccc2e1666209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 16288 bytes

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