Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b160988c5d367e5…

MALICIOUS

PDF

80.3 KB Created: 2021-03-23 07:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 357a6633d44b2ec94a93dccbb1f3619d SHA-1: 401b2282019bd057e68e71084afc4edc9bd42a92 SHA-256: 0b160988c5d367e5293f52303d3cce302fcbca653d12f35b5df0ac53e167755d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://druttle.ru/wix?keyword=supply+and+demand+worksheet+high+school PDF link annotation
    • http://vebejisidag.66ghz.com/lukuxuzalaxumaparotezuj.pdfIn PDF document text
    • http://wujasonuvilo.mywebcommunity.org/curso_de_ingles_basico_para_nios_gratis.pdfIn PDF document text
    • http://creditreportfast.info/211256833875zfge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ffd3a2b6c2fd.pdfIn PDF document text
    • http://copyrightreports.com/gomoridizozegmk3u.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/call_blocker_app_free_for_android.pdfIn PDF document text
    • http://mailedflkf.site/why_does_my_ge_microwave_not_heat_upspemt.pdfIn PDF document text
    • http://begetus11ppz.xyz/catecismo_maior_de_westminsteriw393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fedf582bd4cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5fdd31b02ed41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5fec8f52c5191.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/siperovaxirodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_603e98982b9ab.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/96103018869.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/craftsman_chainsaw_16_36cc_fuel_line_diagram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ff8d9068273f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457839/normal_5fdd06aee9f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_601b426fd30a4.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/gupojakami/29897685213.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/lebuta.pdfIn PDF document text
    • http://wusutinewipus.epizy.com/remerazumofosevogowew.pdfIn PDF document text
    • http://labopum.rf.gd/amritsar_shatabdi_on_which_platform.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/5463956240.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/48123922479.pdfIn PDF document text
    • http://sezigan.epizy.com/rubinifodux.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/outofmemoryerror_at_android._graphics._bitmapfactory._nativedecodestream.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_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 5848 bytes
SHA-256: 72e168424ecc717b97f20f8ff2f694d3fb657f0ff37d84f01e01bc3a7e32a27a
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 11144 bytes
SHA-256: 3e0df6b6b2427dff8eadd98da72c2d8057fe1c843d0de0062f448553bd74fac0

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