Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82c3704b501ee90…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 19:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1198e7869bb0700b7876a6305a1d9686 SHA-1: 1564844941e324fef31ea1b19a190c3340016d16 SHA-256: e82c3704b501ee905926de307f0b7cad9d9818e3ca72ac70e69c28759845ac08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this, indicating the document's purpose is to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=you+waited+by+travis+greene+lyrics PDF link annotation
    • https://medpressa.ru/files/file/20814937047.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/1470832071.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/febopugenowifemegagu.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/pujagifufu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/fagebazebe.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/wiwokoxulafamegarat.pdfIn PDF document text
    • http://baove24h.info/upload/files/45983959716.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59702260039.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/90953556264.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/jagitarab.pdfIn PDF document text
    • http://air-con.ru/upload/files/24015697423.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/nufevakusurifax.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/wubelorudimok.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/83513253500.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916134800.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tosagunaxafurenul.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kokuduwejiwobeg.pdfIn PDF document text
    • http://lg-palette.com/upload/files/kogobojewufura.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/zonowufudejovig.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/64312256276.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/93607135582.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/guxutilozojefaxit.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/94838413696.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/riranizuv.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q4qnj5aepi8j54ct89ei1fvjgv/lisepepugatu.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31618047276.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_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 18444 bytes
SHA-256: dbe64dc0bf46d6718ed02c7f87e05a302c7ccbf8143c8643ee2112e8d6951ce0
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 11036 bytes
SHA-256: 2f3a25098db553893a039b2159208dd40820502d73d86fec07ce4454dd7bbc7c
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1