Malicious PDF — malware analysis report

Static analysis result for SHA-256 8980181fae2dba46…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 08:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ed6d04c305000ff18fb218add144c79 SHA-1: c4f043f464dd7fb755c9dc37c68c8e97494a485c SHA-256: 8980181fae2dba46d353e4a0a7a7b00e24bf21f81fff3fac9583bc7e6a62b2e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to obscure the true destination or spread malicious content across many domains. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://ketchas.ru/uplcv?utm_term=phone+keyboard+apps PDF link annotation
    • http://toroisg.com/public/images/files/62389802131.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631457881.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/25737977276.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631178394tJsB.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/24817615503.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/68578345755.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/pikeseritenoxufisipemejak.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/zamowalininusogokat.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/30916077024.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/98537605879.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/zuzenodijovabisax.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/81492644371.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/51ad2e240f5b67e4f222a1bf31e8a624/fakimip.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/34289951978.pdfIn PDF document text
    • https://hssanesteban.cl/files/pivonorukagenovagusuk.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/lonazofesafusalajafonuvid.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/9441696810.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/786b49b8fa33ed4c83eb0e6e6cab3e8a/19950140952.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/49175002623.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/gajogin.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/siwoxapotonilupo.pdfIn PDF document text
    • https://blv.by/upload/editor/files/gomotubepiluxugogegesik.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/wiwemomedigugunezepolasuk.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/67459696181.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 10600 bytes
SHA-256: 2224d1443411ef88a718bec4f56d9a90a168fa056a6dddb129e125a562ad7a2b
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 16684 bytes
SHA-256: ca4c267521f88c56edb687696eb987581c338b9f9585bc3743c4e76b49d435c4