Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4faf016154de061…

MALICIOUS

PDF

83.9 KB Created: 2021-03-23 01:03:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 75f7979b0843fd8f6eafacc4ace2da32 SHA-1: 9fe4537a106406cb1476478b9ebb67148fa0d3dc SHA-256: b4faf016154de0617476b05688aa5a3c8776fd22a1f6ff0ab5325c42d0ac86d8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. While no scripts were explicitly extracted, the presence of numerous external URLs, some hosted on disposable domains, suggests a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/award?keyword=best+ebook+reader+android+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fdb82e022718.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/290585.pdfIn PDF document text
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/6302655.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/fozibefufaxuxazi.pdfIn PDF document text
    • https://vulagikivup.weebly.com/uploads/1/3/4/2/134234906/6064290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_6027a334d0dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/eif3Lge/44778683603.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/bitrix24_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/igsYjaC/stack_pop_time_complexity.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/rosumat-ribaxe.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/xedemepusuloloni.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/eahfgc9/nilibamubipa.pdfIn PDF document text
    • https://cdn.sqhk.co/mubasetopagu/gaBhjgf/video_maker_free_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_603e8daf53087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_602063e16f5b3.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/jgcyihN/paweburekamovamejibebazop.pdfIn PDF document text
    • https://nukusiluvo.weebly.com/uploads/1/3/4/6/134612364/dcfaf7aeb5d.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/sejarah_kereta_api_indonesia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://terumalok.atwebpages.com/61575148631.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/momos.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/67316945676.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/lipigisozuf.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/where_to_start_to_become_an_emt.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_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 5256 bytes
SHA-256: 1197d247c8d0383b1711cdb426c58588233000681f29bb5a43526f47c4bb903e
font_01_sfnt_off00011bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 11180 bytes
SHA-256: e8cddf5012fae069641f3d6d5660e70b93c39f8de2bf4a33bb58e5c86bebc3b0

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