Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdd66b61b488ad0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 17:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c04014ab18436bc358b5d8e9537cd0db SHA-1: 083f6a21049e1c60c17a973bfee8659cc825a782 SHA-256: dbdd66b61b488ad069fa9d8a25ae76b3a58c28eeab17706934a67ce98fae2dcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=styledoll+3d+avatar+maker+mod+apk PDF link annotation
    • https://suncables.co/images/file/zopisek.pdfIn PDF document text
    • http://vititanon.com/user_img/files/juliwi.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/rosaduxujepak.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/16853862897.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/94875287052.pdfIn PDF document text
    • http://coumert.com/images/file/gibab.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/63917218424.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/vejuxux.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/gadiki.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/8876605215.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/23797835051.pdfIn PDF document text
    • http://195exim.com/datas/files/65126754599.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/63472380029.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/31428660499.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c43hnf2uio836p77lnu4le0kg4/3204737974.pdfIn PDF document text
    • https://marosme.ro/hirek/file/13358678607.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/bipitepuzuwadediwolej.pdfIn PDF document text
    • http://ccadl.com/files/20210909070924.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zuvidupujadikugagotiveji.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1dde6d4b4---rakax.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/83318942554.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/29011445439.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/20690728471.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/zunixuvowupex.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/64578434915.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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 17772 bytes
SHA-256: 34d5970eca4cd9c30c30ec36889d9f084830c8d633f0a8b6551937b2b70ec985
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 10708 bytes
SHA-256: 4556fca73769bbe4d2079f4dc6aa680540eb0da98baa9d372be57b1c2a336dd8
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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