Malicious PDF — malware analysis report

Static analysis result for SHA-256 813cbda36af087c3…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 17:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 229785b5b6abf4a222e4a06d5542fe58 SHA-1: 0d9d2f55d1f3cbd47e0a60baeedbcd4121b2c75e SHA-256: 813cbda36af087c3c2d5ed6c520c7efcb39d7526aa5607509f922c568fd03b2d
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'strategic marketing pdf'. The presence of embedded URLs and the overall structure strongly suggest a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8029

Heuristics 4

  • 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
  • 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://kuzutuzo.ru/award?keyword=strategic+marketing+pdf
    • https://static.s123-cdn-static.com/uploads/4405467/normal_5ff1d11942135.pdf
    • https://cdn.sqhk.co/zozijawutuxu/g1vChbC/vosapegi.pdf
    • https://cdn.sqhk.co/pefemezized/iiDgjgh/72410372680.pdf
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fd17d7d358dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mikipifovusi.epizy.com/60440303569.pdf
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_8d97ab1041724b24b70a9d57ddafcef9.pdf?index=true
    • https://s3.amazonaws.com/zukogi/biwomerikinexosarosu.pdf
    • http://zoxumatodemake.rf.gd/73774187770.pdf
    • https://s3.amazonaws.com/janodojivi/zapujir.pdf
    • http://sidabimesalib.epizy.com/guidelines_for_foreign_body_ingestion.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/sisogapof.pdf
    • http://lufasojaweg.epizy.com/gavanuvadanez.pdf
    • https://s3.amazonaws.com/dowesitobuga/which_is_the_best_scroll_saw.pdf
    • http://soromerib.epizy.com/kokesudomuxaz.pdf
    • https://s3.amazonaws.com/pewibim/rodojefegunojixe.pdf
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_96e75c164d7d48fbbe04ad6cd0b26f66.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010171.bin
6ed886ca2d2327958524124e4ad1824f9e8d74a72e7a902d3845345f9966e943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 7972 bytes
font_01_sfnt_off00011bf9.bin
3ef0dee0d3de112f595caa8931d9dae9c0b558f3bbdc58c7dbdb287200570140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 5432 bytes

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