Malicious PDF — malware analysis report

Static analysis result for SHA-256 a091f50f75fcc555…

MALICIOUS

PDF

81.3 KB Created: 2021-03-21 02:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9612391e0daafb1da4195d7b61a46d1c SHA-1: 2e9a59064f96ff679a5781171f4086a8336bdc91 SHA-256: a091f50f75fcc5556b7a5203e5ba1099b348e62930ab1dd1a17106d6a0897a6b
142 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of multiple external URIs, including a link farm on disposable hosting, combined with heuristics for urgency and invoice lures, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jottigo.ru/wix?keyword=construction+estimate+terms+and+conditions+sample PDF link annotation
    • http://ronifibofizet.medianewsonline.com/579868745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_60245773f0826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5ffc7e0fae552.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/6000050.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/centrales_termicas_de_vapor_y_generadores_de_vapor.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/historia_del_calentador_solar.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/safemugejurolof.pdfIn PDF document text
    • http://alphabitx.com/folelulajujedemebuzafuycb.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/public_administration_and_development.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/60502102756.pdfIn PDF document text
    • http://belkwigs.com/miluxogeperutebomimatae43zh.pdfIn PDF document text
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/balom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d13096-a2c7-4fdb-83bc-ba3fd50d2599/house_of_morgan_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8547ccf5-0bd0-4f2f-ae90-73a297e1d0d4/wovagizasalamikipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846779c9-76b2-43f9-a31f-2733a40bed61/55375241160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b71deb-6e0d-42f7-8e62-23e9e787a4f4/much_ado_about_nothing_online_book_with_line_numbers.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/bk_shivani_quotes.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/xazasaf.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/zanegebuv.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_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 5124 bytes
SHA-256: 9f1512acb54ff8235ad21cefb73c67e94e1f19e6d1303bd68883ffe9a2ece66b
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 11660 bytes
SHA-256: c5b8904495cdfaf85267b34401111eca859f25f3a1ebb167fbbc3782e89f3fd4