Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b0a12456fcb5c6…

MALICIOUS

PDF

74.4 KB Created: 2021-03-02 13:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d060660d7f08b1c4a498348bfbaaa2ac SHA-1: 98952499bdfc2d263f7d39d4136631a7229c6414 SHA-256: 30b0a12456fcb5c6f3b2d0a6d4b2eba4d8f77b0222662b0d3556f6f895213bae
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to 'gimoguvi.ru', which is likely part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of using disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+do+you+construct+a+right+angled+triangle PDF link annotation
    • http://midunetojonawiw.mywebcommunity.org/16945426427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fdb6a5a28280.pdfIn PDF document text
    • https://cdn.sqhk.co/sivofedexim/Ijb0if2/jowizopidisaxodima.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/cot_sheets_for_baby_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/iaAhhgj/nizaxeleran.pdfIn PDF document text
    • http://gofidiva.iblogger.org/rurevixa.pdfIn PDF document text
    • http://komikewewi.iblogger.org/coordinate_graph_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/68Yhfja/international_business_news_stories.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/qrajhuq/roadside_turnout_near_me.pdfIn PDF document text
    • http://zixemij.22web.org/50570009929.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/cuales_tipos_de_sistemas_operativos_existen.pdfIn PDF document text
    • http://xajuguzim.iblogger.org/be_with_you_2018_eng_subtitle.pdfIn PDF document text
    • http://dexujin.iblogger.org/arcgis_for_students.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemujiv.epizy.com/50223679704.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
    • 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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 5356 bytes
SHA-256: 30264dea04d79cb31b98b553d1355c0d789203fd9f3ad9c61064db6baee975bf
font_01_sfnt_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 10532 bytes
SHA-256: 227e158c94957e38a3d65c6a4d567a571d9eadf46400613e9f3dfb7519775d4d
font_02_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 16072 bytes
SHA-256: 3da9309f7c28e01a20d15285b754fad9116e6eb7744d168a0fff2950d6122081

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