Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3454262a21ea59…

MALICIOUS

PDF

82.7 KB Created: 2020-12-29 14:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 965ad6e1c8722b1fcf08924ceabceebc SHA-1: 958ce735b73f3a8fee9b7988cf12690935ba1685 SHA-256: 5a3454262a21ea5908ceb424f118f4efed2512b7e688fd11c09b94f7ee454a97
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic firings suggest this document is designed to lure users to malicious sites, likely for phishing or malware delivery.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=spectra+accuracy+summoners+war In PDF document text
    • https://bugemimeme.weebly.com/uploads/1/3/4/4/134403979/72fcd1cfd7f.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/0a8dd1b6c81470.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ijhcYmb/physics_drop_car_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/qchcKlg/sagosomuvuvukivoxubamu.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/Ahi9DSu/how_high_do_you_fly_in_an_airplane.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/f7b3fb.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/540982c.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/1hd8ghi/brutal_street_2_all_characters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7870e37-87a5-4bd6-8080-a12b65a7da3d/88283369783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90985551-b1ab-419a-9709-f8724464ca6f/22360955635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990b59d3-1f6e-4421-8c62-eb94a18833db/50227570277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1892a445-83f8-4335-ae20-8bdb1bdd96d3/line_break_in_equation_latex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed59ebe-4900-4884-9020-48cc9a98a764/58260808222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc500d7-9a6c-4938-a50a-31e56f6d1f81/23098300812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bebd92-d162-47a8-be57-e55a5a7e6757/telopalelirutije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8c4c0e-4dfe-48eb-b42e-b9ccb362fbcc/que_es_el_metodo_cartesiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84b07a8-732e-405e-a7df-575283428fee/download_s60_software.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_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 5344 bytes
SHA-256: 2446c8496b29a4a5224a29bd4d5756c3ac4a26db65a70f9a04622d67f393dd96
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 10700 bytes
SHA-256: 978ea88310ee680d72565a42de0dfbf256449ea1c82da182c145e3a273be3099
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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