Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a1b4130e8723c6…

MALICIOUS

PDF

81.2 KB Created: 2021-03-17 22:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1ff07de42c9bfff91ce35e4c783a61bf SHA-1: 3b890a6ca67be39a5faa132f5d5661fe6fb0aa3e SHA-256: c6a1b4130e8723c6c9a2ff45fa20006b214b3acc4d5081db5c151e25ed941423
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation rather than user-facing content, suggesting the primary function is to host malicious links.

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://dafemum.ru/wix?keyword=big+easy+turkey+fryer+assembly In PDF document text
    • http://natur-bio.space/76774139966xn1wp.pdfIn PDF document text
    • http://7lessons.site/70986019792nk221.pdfIn PDF document text
    • http://my-favshopc.online/30916135395uc25g.pdfIn PDF document text
    • http://megebuf.iblogger.org/42150408812.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/656d81f4-6779-4ef7-be86-54cf9f76cdcf/31836745922.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_5441e8af68b743d98a46f742367022b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40734c75-834e-477b-a9a2-11378b461298/zigif.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/wozilagonevefuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/castle_on_the_hill_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6a0a03-4a36-48f8-8e3c-b7f8c470b6b2/91131282047.pdfIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_9c7e8f09e38249ddb079e2f64bc06e5a.pdf?index=trueIn PDF document text
    • http://dexifuv.epizy.com/how_to_get_bus_pass_for_senior.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa916d5-88b7-4eb8-b44e-b3fd8917a795/mobosuvawi.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/voguzuwas.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/12th_science_biology_ncert_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/55995433650.pdfIn PDF document text
    • http://lugirike.epizy.com/86176612404.pdfIn PDF document text
    • http://runesufosufej.rf.gd/95340580670.pdfIn PDF document text
    • http://nowoduxer.rf.gd/ibps_guide_october_current_affairs_2019.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_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 5444 bytes
SHA-256: 56c83463591d802f60454bb66cba20f32a8707ff38eb3222c94bfa513a4d3ab0
font_01_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 10736 bytes
SHA-256: dcf77981154fcf0ad0cf77d7b22e9367bcb7da50bf35a69488c5e676fb1d425d

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