Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f6f7013c7d884e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 09:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d346d22de6f68daa7c9b31bab3a1f48e SHA-1: c64524f8a5f341181a8b983818cb9f12efb33b93 SHA-256: e1f6f7013c7d884eddd9c824a0186b24220c5c71b40479d84b41b4e35b3d73dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=japanese+n5+lessons+pdf PDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132d54db34cc---84004655810.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/4312915525.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/jutelovutuzujo.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/77883232181.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/5569211635.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/matujejazoxunite.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/8954760035.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/rukazumuvawo.pdfIn PDF document text
    • http://drironcat.com/images/file/79103114557.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/lujadawosifomopip.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912034837_129408817.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/52943634440.pdfIn PDF document text
    • http://bndweb.nl/upload/files/37951410194.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/6189694551.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109040818495845.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/41235249302.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xogubatot.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/41100005028.pdfIn PDF document text
    • http://effektfilm.de/files/file/88586033665.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/21853944448.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/16887831708.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/71720054598.pdfIn PDF document text
    • http://dd-eng.com/files/files/17778312873.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/50598176755.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/gerovuwitunadofosopuz.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_off0000c2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 10324 bytes
SHA-256: 6093cb9d4a143a1073bfa1db719a0c6b0d8f639c102b413e2e70c39940f22df1
font_02_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 18012 bytes
SHA-256: 7724c07cac7916d61b014c6cc143920f1f033a6c16c4b1264acad451b9a68e7f