Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c83a07a14bf7fc…

MALICIOUS

PDF

113.5 KB Created: 2021-03-26 09:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cc94956fa4131bf2f9c30df011cf178e SHA-1: 6ed32a5e69e32c035ec1f0f0ae89293f59d3c780 SHA-256: a7c83a07a14bf7fcdf8d931322a4d9d0999cd1f973e32aee3dd33be6c0220e97
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=franklin+area+high+school+franklin+pa PDF link annotation
    • http://braco.ru/excel_vba_message_box_two_linesvzagx.pdfIn PDF document text
    • http://jezizidolozoniw.22web.org/jufidigusozewaw.pdfIn PDF document text
    • http://devgame.design/vamozavemenimrtlrq.pdfIn PDF document text
    • http://feedbacrnz.space/85318635845nn6i6.pdfIn PDF document text
    • http://alisabor.design/zudewazeroru9swcw.pdfIn PDF document text
    • http://4kuhd.me/buwudaxigojogamopuzpy4m6.pdfIn PDF document text
    • http://cetop.xyz/ledamobixudinevimow0pagb.pdfIn PDF document text
    • http://tronreserve.online/diwusajefuvoladebimivadqung.pdfIn PDF document text
    • http://fortuneo.biz/anna_karenina_book_online6nhdh.pdfIn PDF document text
    • http://nisufazuz.22web.org/57952783675.pdfIn PDF document text
    • https://zubosaverebaf.weebly.com/uploads/1/3/4/4/134468350/3409f05c8e1481.pdfIn PDF document text
    • http://idealsit.fun/16352656460rrxps.pdfIn PDF document text
    • http://manthoughtswebsite.website/simivoxilezedet5b9hs.pdfIn PDF document text
    • http://shoop-fk.ru/56953294072j55px.pdfIn PDF document text
    • http://xenodobile.22web.org/11042271871.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/donetufemoxanu.pdfIn PDF document text
    • https://vasefifux.weebly.com/uploads/1/3/1/3/131382239/1026529.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/609056.pdfIn PDF document text
    • http://koolmaxt.online/kunabutovadibanapixifaw41bx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizemefuzix.epizy.com/wezop.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/xovat.pdfIn PDF document text
    • http://liforese.epizy.com/nigubifegixa.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/hiring_flyer_template_free.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_off00017e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E27 5296 bytes
SHA-256: 0428c3a81bb502d3e19f5ac0b3421130e9d7897911599e057dcca5dc91cb0c7c
font_01_sfnt_off00019034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19034 11500 bytes
SHA-256: 2dda6ca0c49c4e5a54a87a1f249bb5eb625fe9db0d15d0bcaed13771da2daa0b

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