Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5fd849010530fa…

MALICIOUS

PDF

68.8 KB Created: 2021-09-12 18:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f41ee9b356492cc01b18684bd438e63f SHA-1: d93953de7abe6c9cfa867091f175bfa217a17f3f SHA-256: 7c5fd849010530fa8031c91f37c00bc7d38ff8a7c6a95e708221cd90305113db
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with known malicious redirector infrastructure. The document body also contains text related to 'benchmark android download', suggesting a lure to download potentially malicious applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://huntic.ru/uplcv?utm_term=benchmark+android+download In PDF document text
    • http://weifong.tw/fckimages/file/sirajubomijopepa.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/90127187641.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/ravaw.pdfIn PDF document text
    • http://fygl.net/uploads/file/110821231597.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/fimejusuduwi.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/51077730440.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/tizelaxep.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/47198154850.pdfIn PDF document text
    • http://imoroz.by/upload/file/kitozogapuvoleju.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/wedebuvigefugopus.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/30245109776.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gagumurawubatazagefade.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/53873111901.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/15460226480.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/57764071772.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210904021912161.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/miwamovovesuxose.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e4gftdnq9nn0bk5c39o2am6ai3/31941231718.pdfIn PDF document text
    • https://magerp.org/upload/files/4183862204.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/bokibevefudijerokeka.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/nujojil.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/33508423102.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/jewuzemozojefeledubomujow.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/welovago.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908141532.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/62409078058.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/68743356600.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 extracted file (font_00_sfnt_off0000b1ab.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000b1ab.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AB 14376 bytes
SHA-256: 530d4b557a8f02611c8af5779d1884fc52a0281b1f4c1d1973a058c76436dfa3
font_01_sfnt_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 10600 bytes
SHA-256: 4623e65df96a29ce3d417953a66739605c58237de9db2e6f24607e9bf025f336