Malicious PDF — malware analysis report

Static analysis result for SHA-256 190b22e656462dc6…

MALICIOUS

PDF

75.9 KB Created: 2021-04-16 02:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c18c7d33208a83bc69e9edb8b9a06368 SHA-1: 0dc1245949cc79ceae9244e6878cdf7181f06d3f SHA-256: 190b22e656462dc66c1cfd402a0fc190b822340bd57d86650baa2c8591a6c34a
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs like 'https://soxebez.ru/strik' further supports this, as these are often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=friedrich+nietzsche+pronunciation PDF link annotation
    • http://internet-babki.ru/how_to_connect_rca_home_theater_sound_bar_to_tvw1k1h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_6023b8d5ab1c0.pdfIn PDF document text
    • http://shop50off.info/blood_bowl_2_show_tackle_zonesq61i4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601fab019418c.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/gjdnjfP/samsung_internet_browser.pdfIn PDF document text
    • http://muldwych.com/5869471334477od9.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/qNGidjo/31044260102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5fdc6903032c7.pdfIn PDF document text
    • http://mnatural.space/59647696212rc0bf.pdfIn PDF document text
    • http://hesap-al-sat.com/types_of_selection_worksheet72cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_6024a5750b575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_6328a1727860477396bde6b0cab1a1d7.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_3fd8375f7d4044dcaea09db07e9c8a23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/17821726461.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/juninofikumugedidavonar.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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 5136 bytes
SHA-256: 421dec94e8e544eeb4a42a18ea0d4d9ea560ed0d8fdd14b139ee20cb4441b61f
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 12476 bytes
SHA-256: b0f9aebdbe5c7e4736679cb092bbdc8f613393fef4c0b54c68a3fa134880103c

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