Malicious PDF — malware analysis report

Static analysis result for SHA-256 b650ef06821ad629…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 05:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 84c3ef1ff37283f66cae959e8ff5a27f SHA-1: a582653b37f15294051850b0bee31607ffb04655 SHA-256: b650ef06821ad629b6378047a4594e30aa63e33ed8f7a89dad48eb8affe4ac9f
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports the attack pattern of tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pistant.ru/uplcv?utm_term=aravinda+sametha+movierulz PDF link annotation
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/jijedijusoraxibamatobu.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/fojezevikexitosi.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/wuwemofaxagujetunolutona.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/levigusimajupi.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/fizowinux.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tumozexoro.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/kobixodevemogin.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/96394251087.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36816486331.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/jowibadazazisupog.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53621960420.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/gatupibixoxedimi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab54d4fe76---xupuzogaremugubumeratopo.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/zixafegezite.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/56799850086.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/lujejosuxomofotaso.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/nopunuzupejexitubese.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/begimibasavesibag.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/11828421596131f5cad641d.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/66769425426.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/jolatogewizuxeb.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/ladosepatodesitofigeb.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0c3323f0df4665d07e79cefbfaa218d4/medosidedukekobafij.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/15936059972.pdfIn PDF document text
    • http://pasaru.com/upload/files/99764274133.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kesidodatolo.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wogisijatutedapivomodezex.pdfIn PDF document text
    • http://jainfarms.com/uploads/46589091166.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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10720 bytes
SHA-256: 5630310c80b90e5721ccd3d3d1e7df0011f842be973b29b633c6d01f28ecfb8f
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 18052 bytes
SHA-256: ecfddb926911301667a6801afe29d813024ec1794ec2dfa96667cc9ed892c06c
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1