Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7385a304d62e82…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 00:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 181142da98e6f49b7df064baa92431ee SHA-1: 925e2ec64a872dd6fd790e6f944292938d740d23 SHA-256: fa7385a304d62e8282dde284b8587a1df6af1b6d45e3ae57462e3ddad388445d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are structured with UTM parameters, suggesting a campaign to track user clicks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=apa+7th+edition+citation+style PDF link annotation
    • http://miryangpension.com/FileData/ckfinder/files/20210913_E5074CD3FEE3A77C.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/73039289175.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/8994243260.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/wegutirakuxemadipiline.pdfIn PDF document text
    • https://aodaixuan.com/app/webroot/upload/image/files/tomivawonavewawomitu.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/83380747461.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210924211118.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c6ab8016---60207682310.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/vofugolutazewerasebib.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/58394783488.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/67488125651.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/kuzigabiwekagala.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tajenarolevuj.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/gefokamizal.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/zixiwarisiw.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/37500237466.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/29d561379ea7d35651e0facef03f23ce/sawareseganivi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kufotew.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/wepazumidepovixik.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-7/20210907235722154297.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///17756743576.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jiresipapuxazonabemig.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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 10656 bytes
SHA-256: a1b870d3c65babf7b963b0e1632fc6067de86b91dd549b72edcf184ccc5f8362
font_01_sfnt_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 17048 bytes
SHA-256: 13cc70da0cd269890d5cceee492184817d6e8346696995a1d4085373cba333ac

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