Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b61416bda985aa5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 14:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: aef62cb2d79d50352a867ca9e6e95f39 SHA-1: 8f78ec30208f28fdbcdd449f30b7ca259a7afdf3 SHA-256: 5b61416bda985aa5ec72f0e7fdf36edb14c19c3c4353d2a65a1c483ada9442d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=instal+apk+on+android+tv PDF link annotation
    • http://phukhoabacninh.com/images/files/34971739037.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/nezonebakefuwifarisogu.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/76007484649.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/vasewosu.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/tovizerinadivofirisikodek.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/fuguterivusur.pdfIn PDF document text
    • http://profstil.az/userfiles/file/bofozulonure.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/3088049349.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/71418640186.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/fakomezejoteferumegugo.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/9276252301.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/30836223593.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/20119136617.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/gumavorekedamoxulutubow.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130882d1ac21---wunagizakuk.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/13922321958.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/pifem.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/tokupusafavunelixupoza.pdfIn PDF document text
    • http://hk-keber.de/images/file/vonefekanalowixinobip.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090904525573499.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/mozulef.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/1150821438.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/52944563256.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/98410601240.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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 10360 bytes
SHA-256: 7ae20b388500990cd0c1c383d00339bb9b4f390434010eadc053e9ab5e197997
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 18860 bytes
SHA-256: da0ed36024bb311bdfcc525bd9190e0c312f70ff044e15d04eeec1ecf3ec9cd3
font_02_sfnt_off00011b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1