Malicious PDF — malware analysis report

Static analysis result for SHA-256 711b2af14efd1386…

MALICIOUS

PDF

76.2 KB Created: 2021-10-13 10:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 97a048ba6a4dbc7493e5b786bb031459 SHA-1: 5e0cbb344d4006991d7fe682902b6a66af56c370 SHA-256: 711b2af14efd138608d57bdcd2cab392b18eee4d90c0e4c79c71ee109c12bd14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=drinks+to+make+with+coffee PDF link annotation
    • https://yocarbroker.com/upload/ckfinder/files/xesiwononibakago.pdfIn PDF document text
    • http://arsvet.ru/img/upload/74023904768.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/75622446780.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/88003125885.pdfIn PDF document text
    • http://akafgdsgreawy.pretty-match.com/upload/files/30628615324.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380be1130f6---vikinu.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/wiluwofib.pdfIn PDF document text
    • http://banquat.com/userfiles/files/zikakorokiz.pdfIn PDF document text
    • https://flomogroup.com/upload/files/renetufaremolaf.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/tajelisanetepagusiv.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/24146717461.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79813540171.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xotiwi.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/55291853325.pdfIn PDF document text
    • http://4bx.pl/public/file/90411732098.pdfIn PDF document text
    • http://htygroup.com/upload/files/28695661874.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/68530312137.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/46751991465.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321ba14a995---vuziruxareperizuba.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/nusamujezile.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vapobawizidafafewuzefake.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/38645981118.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F5 10732 bytes
SHA-256: 9a9262bd6f2f7c73540bdb831974f3373e7f42aceb87034fa5e54d6c5eb2c599
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 18772 bytes
SHA-256: 88e1732b8a9570aa740375b4b96e5cd7c69dac9389529842dba19916c3034c8f
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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