Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc4d02c25f0fa74…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 22:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3515fb0af4d83d3d69cf97a288a74975 SHA-1: 0dec9e44a5f29c5fd24d0a0f8ecd093d20b6b898 SHA-256: ffc4d02c25f0fa745650afbfcc9c6a546443648ab80762be58d038f411f84b72
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/award?keyword=how+to+read+literature+like+a+professor+chapter+20+pdf', are designed to redirect users to potentially harmful websites. The ML classifier also strongly indicated maliciousness, supporting the classification as a phishing or redirection attack.

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/award?keyword=how+to+read+literature+like+a+professor+chapter+20+pdf In PDF document text
    • http://hookup154.space/dolby_profile_selector_has_stopped_workingu2nuk.pdfIn PDF document text
    • http://apple-fruit.space/sujeraa04o4.pdfIn PDF document text
    • http://amandeepsadyora.com/why_does_my_washing_machine_make_a_loud_noise_when_spinningre7sg.pdfIn PDF document text
    • http://belkwigs.com/3147976166b30fe.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/4fdeaddb-920b-4032-be95-ceb8f772371d/harman_pellet_stove_for_sale_nh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495cce32-0d28-4261-93f2-5f1edf987ad8/wegifebozeda.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/jikalenaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0baaca9-9251-4494-987b-ef94b6fb8179/search_for_google_play_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9957fa01-51c4-40b4-b1e5-78122d52b25b/physics_class_11_chapter_1_ppt.pdfIn PDF document text
    • http://nulabede.epizy.com/xugajeduwedimo.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/endocrine_system_worksheet.pdfIn PDF document text
    • http://zidaposiwogo.rf.gd/muzegiramev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39af308b-4a15-4501-808d-a12322523a4c/kabopudav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e97474-d1fb-44f1-a79e-d4c542c60d1a/21008430764.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/foxujopuwetik.pdfIn PDF document text
    • http://winulinimax.rf.gd/hd_wallpapers_1080p_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/can_the_singer_4423_sew_leather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff25d0d0-00f2-436a-bef7-bdd2bf48cef8/86645910110.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_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 5632 bytes
SHA-256: cb78ae691e4a005a9f90b7aeb43fcc0c528a7d0384c68cfa4b662f49fae1435d
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 11312 bytes
SHA-256: 369d4ea878b4ab3744956373c20438fb71fac9792b645cc2649b78416f87a61c

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