Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33e93cb60ff9be1…

MALICIOUS

PDF

83.2 KB Created: 2021-02-13 02:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5544d0cd9d5f6fcb31dc996059a593d0 SHA-1: 3f3ce8605b53d0f343d8432e4bcfcefeefb1c359 SHA-256: e33e93cb60ff9be126ccb0e7b92017f5f9ed37a7755f52b2ba35d4f59102d43f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious or disposable domains, identified by heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL distribution suggest a phishing or redirection campaign, likely delivered as a spearphishing attachment.

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
  • 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/aws?utm_term=alien+shooter+3++my+real+games In PDF document text
    • http://autokenn.com/beams_shear_force_and_bending_momentr4ktv.pdfIn PDF document text
    • http://community-day.ru/hillsong_non_stop_worship_songsu68cz.pdfIn PDF document text
    • http://italia-doc.space/online_racing_games_for_pc_3d3lh30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5fd792b8d2b01.pdfIn PDF document text
    • http://yogist.fun/bobcat_843_repair_manual1s4l2.pdfIn PDF document text
    • http://shopsmmv.site/prophet_shepherd_bushiri_booksn06x2.pdfIn PDF document text
    • http://lovechat24.club/stickman_legends_shadow_wars_hack_apk0m5s3.pdfIn PDF document text
    • http://criticcxck.space/biomechanics_of_walking_running_and_sprintingar7yg.pdfIn PDF document text
    • http://zespodsvetkoy.site/retrocalcaneal_bursitis_treatment_exercisescpylu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5ff80c3d4f6fd.pdfIn PDF document text
    • http://trastqort.online/top_10_bittorrent_sitesa1lrs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5feb042ee3e47.pdfIn PDF document text
    • http://idealslim-ordina.site/online_to_excel_converter_multiple_fileszolqc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_601ec23e6de70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_5fe7224a0ddd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 5140 bytes
SHA-256: 87bf37646a3f9dee220222ac5c8197fa018d77c34b9a8dfa327e50052cc4f24d
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 10344 bytes
SHA-256: 0a1e58a24f3c3315995dbf34f8382d17edc3a18b9ffff28200f49c9c1fbea45f
font_02_sfnt_off0001314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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