Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d64cb38c515dae3…

MALICIOUS

PDF

70.5 KB Created: 2021-02-16 00:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 84fc047dbdd996051976987d3a77898d SHA-1: 0e4b34a3458148367fb0ba6729649fb164306e27 SHA-256: 7d64cb38c515dae35c447a2e8f5cd9b4239bf35fb199ce33c95b4887b8af0e3d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to suspicious domains, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of many external URIs suggests the PDF is designed to lead users to phishing or malware download 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://crophysi.ru/strik?utm_term=how+to+get+rid+of+the+student+version+of+autocad PDF link annotation
    • http://storefromit.pro/heartstrings_animal_advocates_mcpherson_ksex87n.pdfIn PDF document text
    • http://hocostyle.ru/lejaluxans856b.pdfIn PDF document text
    • http://gidepel.22web.org/cs_go_free_for_windows_10.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/pepavaojk07.pdfIn PDF document text
    • http://nesobaka9.xyz/design_of_machinery_5th_edition_soluyeh5x.pdfIn PDF document text
    • http://immorta-cross1.club/banco_do_brasil_pessoa_juridica_chave_j7w0tr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_6013f74f62a75.pdfIn PDF document text
    • http://com-signto6.xyz/892437662535ns8i.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/jjhiwjd/90900396152.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/zVUhcii/89298163492.pdfIn PDF document text
    • http://bella24.xyz/database_system_concepts_sixth_edition2z275.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/hhziegh/mevewukigojesepajumesogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sorogamat/concave_mirror_image_formation_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/hasheem_thabeet_scouting_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FE 3728 bytes
SHA-256: 1ba4ae693bf8018a5324c9f68603768787252289ee266d6de74177919cbb8871
font_01_sfnt_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 5364 bytes
SHA-256: f1f93efe3a002a2f66e4040fc3082271bf925f9546e396a106d58b005e1757ea
font_02_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 11084 bytes
SHA-256: 594b4747730209e9a5390fb0ee27b2cfa962648e7f6ae454fa3e1a8848eb6e57

Open this report in the interactive analyzer, or submit your own file for analysis.