Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c0dc3cd070a551…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a04be4739457c5f789f61d515bf8609 SHA-1: b0a0177477f1c09c6d0adfa4955c73fe190204bf SHA-256: 28c0dc3cd070a5518b7f683452fe565e2f767a44989ad0fd569f56972e6652fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or scam lure. The presence of external URIs and the overall structure strongly suggest the PDF is intended to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ziva-muzika.cz/files/file/31310027186.pdf In PDF document text
    • https://bachson.net/upload/file/danubikewopujizuloxapiw.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/92277091513.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/15679415384.pdfIn PDF document text
    • https://cmf8.ir/data/file/80046692716.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/94068686147.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/18807107416.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2aac55f4---35837445052.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/29272814949.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/pevulesagu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/sawegonaxedaxizolefojova.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354a851e25f---26875811142.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330565cc115---roferop.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/35514320093.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/kokalajedi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1262293352.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/73481296573.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/89967731347.pdfIn PDF document text
    • https://asiapharma.la/files/files/somofexowugisixomigonufa.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/jabafonetenivole.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/fowofadusiseni.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/1368481111.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/51332028107.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/vuzonijivoruf.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/27886776049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+little+big+cityPDF 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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 17700 bytes
SHA-256: f8b089183744df116709df3559c2156c060aa87a7d6b86a43326b81c3a05c1e6
font_02_sfnt_off000128ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 10784 bytes
SHA-256: ad6e4fcb7a1e64330b89735f3da47e05d44c607eddd3774119f8353c08925ed2