Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9e2d4d60a112ea…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 01:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 77aa4b207a7e8d9457a702aa6e640092 SHA-1: 9c917651ac6f8210b719182ada5d02543cb35e94 SHA-256: de9e2d4d60a112ea4f4fe10639d16b3a44ae0126a9f8bb39f5fce5da83418f64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=walla+apk+gay PDF link annotation
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/16856823898.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/64026317659.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jigowiditiwusakila.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/94265389824.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/posuxabesowurefa.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/12714444393.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210916060854.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130d22d28848---66351542651.pdfIn PDF document text
    • http://standardamulet.com/files/files/nabosudanuvapadugexugegi.pdfIn PDF document text
    • https://airxps.com/userfiles/files/wisanev.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/75552262126.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/tozawupedarobor.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/gagimub.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/bozifajutosimi.pdfIn PDF document text
    • http://scpt.it/userfiles/files/bovirakomorabafunebix.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/90915561738.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xepubonof.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/57380631591.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/majemixibawipele.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca5da6b28d---59361835477.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6892021284.pdfIn PDF document text
    • http://land89.com/ckupload/files/5995510381.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/68055184455.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/limakovafije.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210921015705_987427504.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e8b8528c---ligeluvipoludikug.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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 9812 bytes
SHA-256: 54cf37a6c2a0ee610baf98457950fcdb442df2460cdd74414080149894aef665
font_01_sfnt_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 17080 bytes
SHA-256: b1ea45e8dea6181f704fb8e411a9211ecdfcc3d9bcd79bc18aaf9dade7533a0d