Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb1cfb9d1cde94d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 19:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e7565caf68a4f4a489c701fc8be49acf SHA-1: 4d6da810c5e79b5fcb81e894cb8a5880a54dd3dc SHA-256: deb1cfb9d1cde94d9cc25d7ea6cf62192495cd3d5c3194a4ceaf8640e0c00fbc
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable actions. It contains numerous external URLs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=logo+quiz+2020+level+4 PDF link annotation
    • https://www.aicsmindia.org/ckfinder/userfiles/files/detozuwilu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/sujojixevaxivanilos.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/54498547544.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/68950070137.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/buxakajedufawipudaxizefo.pdfIn PDF document text
    • http://mamam.by/upload/File/file/33057447552.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/kexaxojenoforesalam.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/20437694496.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136419fae81b---14598391029.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/75962698569.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/zavedusoginagewofilamepim.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/mufuxemufum.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/31563057608.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/rigeke.pdfIn PDF document text
    • https://bliznacite.com/files/23390047838.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/46975913873.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/39c3ba5038ba7af42783d52d8fb9c4c2/jopipeje.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/sorakupapo.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/16125898217.pdfIn PDF document text
    • http://pneusmarene.it/images/file/nijumuz.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/bazisomadevepemib.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gadufobomikupagisuxo.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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 10300 bytes
SHA-256: a949b0c8b2456e2a98ea353bd04b80a01fee013be509f548d614a69ce8b6c967
font_02_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 14432 bytes
SHA-256: dcf8aee10a35df544ce36cf2136bf9b1cf500be4dd1f72be890fa65e7a2a2f4a

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