Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4dc7dcb62704e4…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 23:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae6ee766336d504811e3d075d29bad0d SHA-1: b5cfdc4b31181cc99bb0843a3c223e86315af793 SHA-256: 7f4dc7dcb62704e42e6ff2ef969f9158626cf967f504f2f893168e3a8d0256ee
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL points to a domain associated with SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=sklearn+decision+tree+plot+jupyter
    • https://xenimaxifoja.weebly.com/uploads/1/3/1/4/131483144/16d763889e751d.pdf
    • https://cdn.sqhk.co/zuxifobiro/hicijjg/hach_pocket_colorimeter_1_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4388833/normal_600e931e2d7bd.pdf
    • http://rafupofamurawaf.mygamesonline.org/fibitifavaxi.pdf
    • http://tewatag.medianewsonline.com/25152023916.pdf
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/dejuvavuj.pdf
    • http://kazaxukiga.getenjoyment.net/canavalia_ensiformis.pdf
    • https://cdn.sqhk.co/xasakeza/heFpght/bigijeben.pdf
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5ff8f4286058d.pdf
    • https://cdn.sqhk.co/kokademesuz/jj0RI8c/sodowe.pdf
    • https://walugudosesex.weebly.com/uploads/1/3/4/6/134608180/pepiralonenowawuguj.pdf
    • https://cdn.sqhk.co/jegamaxegev/jhpBhdt/.pdf
    • https://cdn.sqhk.co/sopirisaset/jejaghz/levopegosurizox.pdf
    • https://cdn-cms.f-static.net/uploads/4371783/normal_60277ede86711.pdf
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fd36b9361d6b.pdf
    • https://cdn.sqhk.co/soxesemu/wLkgdjc/tisodilo.pdf
    • http://lebuvowune.getenjoyment.net/moral_hazard_and_adverse_selection.pdf
    • https://cdn-cms.f-static.net/uploads/4417413/normal_602778965a95f.pdf
    • https://cdn.sqhk.co/vekuniruf/jhjbsyo/bisifemabepurisud.pdf
    • http://xufelaketodo.getenjoyment.net/64474602616.pdf
    • https://cdn.sqhk.co/bipozipo/8gijbjd/votepamome.pdf
    • http://getepitisux.mywebcommunity.org/sojuxokumajetogabaxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://viwudajokufado.atwebpages.com/devi_aarti_sangrah_in_marathi.pdf
    • http://zugepoguj.onlinewebshop.net/98992473128.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_off0000e9fa.bin
3f100db510a87940e3487d2c1e139cf85f4bd123adee06f5974b6e406ae74cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5412 bytes
font_01_sfnt_off0000fc83.bin
79b6f81e7c22588b6f2edd0479966d98cbe23943c7dd6345fa68b201c2b292aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 12048 bytes

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