Malicious PDF — malware analysis report

Static analysis result for SHA-256 403ea4967a2e940a…

MALICIOUS

PDF

105.6 KB Created: 2021-04-20 01:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a2f6b2ece31762b8b4c083a0d7c0a179 SHA-1: 6721c57ef7b89c18052cb143a1ebf48c2d801016 SHA-256: 403ea4967a2e940ae35dd0e32b9701eab0e793ce5f62791c3494369d39fa01a3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=would+you+rather+questions+nasty PDF link annotation
    • https://bemazoveber.weebly.com/uploads/1/3/4/5/134512295/8976162.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/egcgehd/fipuxilu.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/WBZkhie/2611535400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fff48f9a5f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_606e60a8a8f6c.pdfIn PDF document text
    • https://cdn.sqhk.co/mewovegid/ciejjii/11539012989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5fe9a913c7daa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_6000c9dd70a5b.pdfIn PDF document text
    • https://welusagosa.weebly.com/uploads/1/3/4/3/134355806/4909588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6021e8c2a8812.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/phbBieh/nokexolepekuwuzedaludolof.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/sijEoid/biberafuremozamito.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/blank_calendar_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/TzGUhjE/zowaxotuposefinelexa.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/iaFhiqc/stickman_sniper_battlegrounds_mod_apk.pdfIn PDF document text
    • https://vutuzanepe.weebly.com/uploads/1/3/1/4/131453188/mixudevesopupo-robavinurujelap.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/jd9XWja/vetile.pdfIn PDF document text
    • https://jejenovo.weebly.com/uploads/1/3/1/4/131454593/9114748.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/lift_as_you_rise_by_bonang_mohale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/critical_path_r._buckminster_fuller.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/wopemim.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/72478280.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_off00016114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16114 5156 bytes
SHA-256: 87fcbacd990b9ef2c17c418b683a776d74f2e17682a1e4038e8a2f2eb6e90a2b
font_01_sfnt_off000172a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A2 10604 bytes
SHA-256: 72e9316ccc3fbf09fafa6785d31cd1bdd4bf137a2458160143f4fcececda8593

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