Malicious PDF — malware analysis report

Static analysis result for SHA-256 289641bc2ee67c4a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 11:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 80ad9716099a80afdd759fed1c42a62f SHA-1: a08ab5e7dd02227a093b160bde0170fad1472e0c SHA-256: 289641bc2ee67c4a0c09f2dff814ec3ba69651e46d74185e29cb4262dd515e12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The presence of a 'download button' heuristic and ML classification further supports its malicious nature. ClamAV detection confirms it as a phishing trojan, likely attempting to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://inwebjor.ru/uplcv?utm_term=games+adblock+apk PDF link annotation
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/61646869054.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/donikitowigitaxipubogivef.pdfIn PDF document text
    • https://olterus.com/contents/files/lawon.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/7744026412.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/48317956999.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/devunapuwilife.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/76597845060.pdfIn PDF document text
    • http://leeandrewdavison.com/download/53655535612.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29596516240.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/vutararelekaf.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remugitaz.pdfIn PDF document text
    • http://asqcert.net/files/files/jagefiriwubatorutoban.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/fujivugesi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/demivenosukozox.pdfIn PDF document text
    • https://jagominum.com/contents/files/89745256456.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/16672972562.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/21451892311.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/87075687887.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/bosidesotivozudowetara.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/zubebunifuwisamedurukomut.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/30253309413.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/15869790793.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/41419305116.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_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 10552 bytes
SHA-256: 6f737ac8fa7c5dd25b31a35d6461a8e5d263470ada4c4b59a740c4f7cbc68b74
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 17444 bytes
SHA-256: 74d1b3d9660d3ef902221546a1ed1dca2ad36a845a5ad7b9aeb27d90ef95b67c
font_02_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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