Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dbc6af0a24bee3…

MALICIOUS

PDF

128.2 KB Created: 2021-02-22 16:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 978928a09f96dc322229c15c978f5dbf SHA-1: 9e0f550394868233a76380a39a0e4f4baced81d1 SHA-256: 87dbc6af0a24bee356babc05a586c2c3c2d7bc41bab48050a473d22b311b98aa
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, several of which point to known malicious redirectors and disposable hosting. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/wix?keyword=fifa+2020+release+date+australia In PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/9392530.pdfIn PDF document text
    • http://ninudogexefeg.22web.org/mafukuxosujas.pdfIn PDF document text
    • http://luxshop21.site/simplifier_une_expression_littrale_5eme_exercicefecsz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9ada5af802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_6012de7996ca1.pdfIn PDF document text
    • http://my-favshope.online/zorusuvidizozusumumalrjojz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600b6261a713b.pdfIn PDF document text
    • http://cherrypimp.online/telecharger_encyclopdie_universalismy46b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5fd04b339d43b.pdfIn PDF document text
    • http://testvvd.xyz/931740270420it49.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/tobito/18070522155.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/league_of_angels_3_hero_guide.pdfIn PDF document text
    • http://vipujaxetixise.epizy.com/3814523612.pdfIn PDF document text
    • http://pizoxuwa.epizy.com/detailed_project_report_format_for_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/acetate_paper_sheets.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000192a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192A3 5712 bytes
SHA-256: 2cb41cc21bda9c64a4b4d8f414795972ae5c802aef13e2c3f8cf434257099d15
font_01_sfnt_off0001a62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A62C 5132 bytes
SHA-256: 527945bc19554e7a59dd130388dbb8f79464e759c5448a5f2a1dd7a4c2bebf90
font_02_sfnt_off0001b7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7AE 11124 bytes
SHA-256: f2bf31c9cf9279acffc49c5668bce04e0138cddc8aab7c89bfbc2ba3bfcfb9e7
font_03_sfnt_off0001dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD7E 16232 bytes
SHA-256: 0865ea5686e30d19842a941efae749c2e92da649021023aa876fc32c67f43dd0

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