Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1b895aef811a96…

MALICIOUS

PDF

116.0 KB Created: 2021-10-07 14:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 07a4ed1cd45fd951150af686d86ba462 SHA-1: d163d35ea8ebc4a797c4c804025b2f04b41ce44d SHA-256: ed1b895aef811a96347d60ea6fffd7c50ed708e039eb8e9065b58c674e181825
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=cosby+television+show+cast PDF link annotation
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/poxewunilufamifofej.pdfIn PDF document text
    • https://teamcode.net/upload/files/4059021895.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/beravuwipezagejidipa.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/70379283423.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/11761509571.pdfIn PDF document text
    • https://anvatsaigon.suzukihungyen.net/data/dulieu/files/16514900070.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/93979270301.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/51034497582.pdfIn PDF document text
    • http://atrsara.ir/resource/files/gokalibanebudojodan.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/guvuvivugikeriz.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/96817985557.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/keriwenajomapotudubigo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b8f09414c4---majeduforedumibun.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/9688726150.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/labukaniwelubuzolaxuzaton.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614583f358e10---12768562708.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/93395345704.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/powamirifuratuzurifebube.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/40366121180.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/gazuba.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/defobojuvinowegonitunoso.pdfIn PDF document text
    • http://climtech.com/files/files/jenebujokefulozi.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/bafawavej.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_off00015b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B43 10664 bytes
SHA-256: 07151c1824939b1f2be7478344824ea85b7303927b1734231cc2376d9b64f11f
font_01_sfnt_off000173c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C3 20888 bytes
SHA-256: 6e76c295d13ab74eac8f7627501fca8f4991c168d36e1d93c9c7038aa46f0dbe
font_02_sfnt_off0001aa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1