Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cbf0ee69b3ca87…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 19:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 70712de0cd8919ffba48b19015478773 SHA-1: 14fe3ccc70f839dbf8a307f8a94509fa6fb19bba SHA-256: 23cbf0ee69b3ca87d2fd4f74685bad68abca9b817acbcbe302341a0d44f727d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=after+we+collided+full+movie+watch+now PDF link annotation
    • http://aci-immobilier-douai.fr/userfiles/files/fawodumivamin.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48818221616.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/rapikujozutazu.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/goziditadobizukatajedos.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/pubuputigepujer.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/refajegalisiw.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/54267268730.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/41721564654.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/22747817923.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zilitam.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/53869992355.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/reziwurona.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/31350758880.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/jekuwazigomuxiruxep.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161452ae6177fb---4624827115.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zusiluvutofomo.pdfIn PDF document text
    • http://vswet.ru/f/90377548048.pdfIn PDF document text
    • https://businesslife.com/content/file/nafulapiwovoju.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/nedinibunupotoropajavo.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/dexuf.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/xovedililibewimasifupa.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levimukojepowalalibajedu.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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 10804 bytes
SHA-256: 1716c4f9031bf6a0e58ad191a44cb5555478a24e981dcc36b1e1937f4f0b7ebc
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 19004 bytes
SHA-256: 3b098958fe8adcffb604d540a6e88a71c7a0bf72aa5e32db7fce2d381941bee1
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1