Malicious PDF — malware analysis report

Static analysis result for SHA-256 75270c9bf7bd0aae…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 16:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0e37e3dd2dd7669803dc060aaef90c5 SHA-1: 1306b75c93755321c495933c3bc6ccf5a04e469c SHA-256: 75270c9bf7bd0aae26b22c6c613bdeea95a185281b5832d39655ba1da4b3fe8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=8+ball+hack+mod PDF link annotation
    • http://baltic-rt.ru/ckfinder/userfiles/files/jojugovagoxe.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/filowubadizetazivedebejez.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/18887957839.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/perekuralawa.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/junafetunumuful.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/galemaxuxebebukanani.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/30498123696.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gonidijol.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/mulorudaxugupuxiguv.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/saxelakaruto.pdfIn PDF document text
    • https://proxus.nl/file/89311345039.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/gubidusisoraxutarofawepux.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb8762ed2---92011669467.pdfIn PDF document text
    • http://njchemland.com/upload/files/54495480153.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/renunekenoni.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/80885880461.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/44343624572.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/75146308031.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tezudovemek.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9a4e9697---91077245742.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/rexasibuwe.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/koforekupezogelavemuwus.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/laxivikumobevivogupe.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d7bab124---50405636215.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/37279781247.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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 19784 bytes
SHA-256: 7060faae7c7e3f613bdcf2be05def9eba59ee47b5a308becd6add90b47b42896
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 10284 bytes
SHA-256: 6512fe0dc2e4ab0166da456fe96975ccde59caa6b8f6b3467a617cb54e5d9aa5
font_02_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1