Malicious PDF — malware analysis report

Static analysis result for SHA-256 9939235ebfe18ca6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-22 17:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d0d0088ff5b5df8394f152f9098e309 SHA-1: 2b8d1e6966f6b34791e214dad874d864cd0bddec SHA-256: 9939235ebfe18ca6d3f7cf396fa108a851cd11ee5eee1c79063b7148918e1f49
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, with one heuristic specifically flagging an algorithmically-generated URL. This suggests the PDF is designed to exploit vulnerabilities or trick the user into visiting malicious sites, likely for credential harvesting or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://orderleesushi.com/uploads/files/44035872645.pdf In PDF document text
    • http://bestpokeya.com/uploads/files/77690226104.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/16323188350.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/69775946286.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/55125493618.pdfIn PDF document text
    • http://indel.sk/userfiles/file/kexagu.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/87944737419.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f46df664e104e13762c69fef23ea48b4/41561389746.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/fowawufogapuzuvoz.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/ganilesomagiro.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/namujujedalew.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092013103473499.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/31314429326.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/8154040951.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/48293971673.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/99878887072.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/66066225865.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/76248857676.pdfIn PDF document text
    • http://rsentco.com/upload/file/mevadovasodewavodofaf.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/43763800751.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/niwaliwitipigibimogojami.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109191944552537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=magic+tree+house+christmas+in+camelot+pdfPDF link annotation
    • 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_off0000bf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 17200 bytes
SHA-256: 0e6ca9388073700b6fcca5b60e018f39f855e75c587b0641fb12ab1e2a1661ce
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 11160 bytes
SHA-256: 7049ad7387e7c8071fd0a2c3bf7f5782e197268508a93274804641d3649b05eb
font_02_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1