Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ecef1eb3de5d34…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 08:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c06db948f78d98467b4e6144ed8f81b4 SHA-1: 3309a82dea55ecba2d0cc228b5c06373bf48bf61 SHA-256: d6ecef1eb3de5d34e5f863528b56cf0ce12238d87e76069b9ea531f89722f9d2
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. No scripts were extracted, but the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=typical+gap+wedge+loft PDF link annotation
    • https://tmtteks.com/files/14569136343.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/detonomikinifadevizu.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210923114701.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/75814232043.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/zuxede.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/77927332154.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dusesuworibap.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/19249317301.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a62c53315b81ddf8ceb1e037705571f6/43044781024.pdfIn PDF document text
    • http://egitara.com/upfiles/files/84846914268.pdfIn PDF document text
    • https://ijestr.com/ckfinder/userfiles/files/dufajijo.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/54166725426.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/79227798253.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/14250225467.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/zikozovexa.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/60486566942.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/70183542498.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/tamapasoripolegaki.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/9701855686.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/11128359350.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/vuxogizenewelomajoko.pdfIn PDF document text
    • http://vpsystem.com/files/fck/nadupi.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/xoruniduwokinolanep.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be46e4f073---42987258521.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_off0000b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 14308 bytes
SHA-256: fbef9e6421b6db559e5c625c5cf8ebfb4e00448264034f9efe41143b4f04ec49
font_02_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10588 bytes
SHA-256: d4790d0ad4894e633f39f07f9ab651853e2402d74a44c29709c8087e931c4c68

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