Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf2e328a5a7c480…

MALICIOUS

PDF

72.7 KB Created: 2021-02-08 09:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 35feb11b049710c19d992ac813a42820 SHA-1: 142f5dbb987017090067008636e90209a98a14e9 SHA-256: 0cf2e328a5a7c480b51d5dec81d880c29e798289c76dfe62d7b540fbc99c7888
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of links and the heuristic firings suggest the primary goal is to redirect users to malicious infrastructure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=south%20film%20video%20songs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_601c6a4aad5c5.pdfIn PDF document text
    • http://tevfikyuce.xyz/wavelet_transform_feature_extraction_pythonq2ax9.pdfIn PDF document text
    • http://xusonawifofi.iblogger.org/aws_bucket_terraform.pdfIn PDF document text
    • http://kufudizaja.22web.org/extreme_activator_windows_7.pdfIn PDF document text
    • http://xexajume.iblogger.org/34984822266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitimixilu.epizy.com/bolton_sixth_form_college_application.pdfIn PDF document text
    • http://zijemuviwovo.rf.gd/amoeba_sisters_video_recap_diffusion_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/gatling_tutorial.pdfIn PDF document text
    • http://wobagelamabix.rf.gd/anti_slavery_policy_statement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/gamov.pdfIn PDF document text
    • http://nirobow.epizy.com/ftse_china_50_index_factsheet.pdfIn PDF document text
    • http://fuzimobikuxuta.epizy.com/36680961705.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/dish_network_tv_guide_update.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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 5180 bytes
SHA-256: 40fc16e2fe121818086d13cb2c06a1cbc6bf222e443343d610f5bf950ecd1ef7
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10628 bytes
SHA-256: 1a2732b624b11fc6ab66b1b81c163632da2ae8d6dcb6b67d21e69e73e230f7be

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