Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4bd7cb6a1796f4…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 14:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c78c5ddbf8511132739d89d959745a3e SHA-1: 407165f2c9a1fb5209bb3e8fa96e45a276639f33 SHA-256: 4f4bd7cb6a1796f42682b80a29354466227e3ee95b6c0bac8b4762130dbdb9e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://zxpgw.com/userfiles/file/87511019147.pdf
    • http://artiguardia.pl/userfiles/file/46949279711.pdf
    • https://yasacompany.com/upload/files/relifiv.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/84769294010.pdf
    • https://erdenetpost.mn/userfiles/files/zonok.pdf
    • http://khaskhaan.mn/uploads/userfiles/files/47006082611.pdf
    • https://marblobathware.ph/app/webroot/img/files/rabipon.pdf
    • http://thephinhmienbac.com/upload/files/78630923109.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/demupasalegagegozafaziv.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/6940638517.pdf
    • http://polyalpan.hu/_user/file/72632678186.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/4052828883.pdf
    • http://rockefellersgold.hu/editor_up/42144461046.pdf
    • https://patoman.ro/ckfinder/userfiles/files/vogupomuludal.pdf
    • https://kermanrooz.com/img/files/36852783394.pdf
    • http://yangpupark.com/uploadfile/files/popoxopejofofilud.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16149103b6b031---bimizuwubesaxopabunijo.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/87e3c0a0ddc898b0d49e60817ba8453f/70184139841.pdf
    • http://bogaarchitetti.it/userfiles/files/47672553421.pdf
    • http://detskypohar.cz/upload/file/vaxazuno.pdf
    • http://wisdomtours.net/upload/file/kadutevu.pdf
    • https://md-bud.pl/szklo/photos/file/34682560143.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/46100689751.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=coc+new+update+xmod+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 16792 bytes
font_01_sfnt_off0000c8b2.bin
e8e85f694b46c1202774ed9344113e3fd7e7681c366c70c05474eeafbc163d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 10636 bytes
font_02_sfnt_off0000e119.bin
f7653b449eeaf73b0bd4b1626b778cf6e8235579b6f8450807cf838b4c6ee0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 15728 bytes

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