Malicious PDF — malware analysis report

Static analysis result for SHA-256 274674d00b8c2b00…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 20:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f283a0e337fb082ed14bb764efdf065 SHA-1: 7b80b1744975abbc24dc425a6d3a83a43cd60b4f SHA-256: 274674d00b8c2b00156cf96d3142935ef0096aec2cf657ef224c38ab18c334ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of many unknown-reputation URLs suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=new+car+game+apk+download PDF link annotation
    • http://www.sctiec.com/up_files/FCK/file/vevewim.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/4441036464.pdfIn PDF document text
    • https://southafricapools.com/contents/files/42078715913.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/selobaberozuguxulowegata.pdfIn PDF document text
    • http://blccy.com/userfiles/files/jinoniwusavexi.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/25477924106.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/pijajipuvimusi.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/vabun.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/53055394935.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/weganafaxorujavutozamujo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366de77d4fd---jejanoxevaregefisoxube.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/beranofoju.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/zifijuxesan.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/momuvata.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363fd51607e---vigunujoguxumafetuxijej.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/wunokoboju.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45816814499.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/3218345018.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/33770038722.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/22073672432.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/82583442426.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/37878845711.pdfIn PDF document text
    • http://vodova51-53.cz/files/wopaf.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/33754794919.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/030322302165.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_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 10656 bytes
SHA-256: 056b42aeaeb166eeba98cea5ed04ff384b3de1372ade523a9fed11de1c96bdb4
font_01_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 18044 bytes
SHA-256: 94efd97364055854dc925bd665361e30c19c100d3ee9847e16223d3a36e59a95
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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