Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77f26412e06f81d…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 23:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ba3bc4a4ae053cd500bb85b016ee5ae SHA-1: 1b312b8c53e1a4c394b3fed1e808daeccf40e478 SHA-256: e77f26412e06f81d140e98c420cabac5dfc71e14bac5bdc361de17274b37a6e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, likely to further malicious content, and the ClamAV detection confirms its malicious nature. The presence of embedded JavaScript suggests an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allefrgycg.news-read.com/upload/files/22335734387.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109261106505171.pdf
    • https://k31szmq42-nu28.com/contents/files/62358651755.pdf
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/29552546627.pdf
    • https://adtw1.com/ckfinder/userfiles/files/nuporawozavudawepu.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/32514134403.pdf
    • http://tienphat.vn/imagesflashupload/file/vexesokesanerarez.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/53177989459.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/wepodoroxunokabewov.pdf
    • http://jubileejec.com/userfiles/files/tapuravenumunubinex.pdf
    • http://kovovyroba-nosniky.cz/UserFiles/File/36717754714.pdf
    • http://byecook.com/ckupload/files/mogasatise.pdf
    • http://albarossa.jp/js/upload/files/fevifisajipok.pdf
    • https://triyoga-tv.ru/userfiles/file/94144158678.pdf
    • https://autosaloncenter.com/uploads/file/38080384121.pdf
    • http://sichera.eu/userfiles/files/89267720527.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d522544ab---8162160925.pdf
    • http://geo-equipe.it/userfiles/files/9987787589.pdf
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/pofagenuzejigogut.pdf
    • http://www.deewanalarab.com/up_imgs/207099448.pdf
    • https://wmu24.ru/media/file/zojinusiribewuwofa.pdf
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/78117491355.pdf
    • http://krasneclanky.cz/uploads/76544567891.pdf
    • https://www.utn.ac.cr/sites/default/files/files/44208208141.pdf
    • https://tranhdaquyhn.com/uploads/news_file/58139499806.pdf
    • http://templeton.sk/userfiles/file/21569696099.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=3d+powerpoint+templates+free+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_off0000b509.bin
f79a7127e7527a86fc752645ced11a2f4782b2c319618003d9f38f7ae432e632		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB509 16224 bytes
font_01_sfnt_off0000ddda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 16792 bytes
font_02_sfnt_off0000f5f1.bin
30d4451f76bf81f2c11ea04f79cc108a03b5bbbc477d9c1295340571be40bd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 10820 bytes

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