Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd72f34fd1b56aec…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 10:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05939ba00df549eaba8aa37bad23c9bc SHA-1: bd18db309c828342b8244d9558aa252a68507af2 SHA-256: cd72f34fd1b56aec13c508dbdc3ded169acd5c6c1528bb4c28915262238041d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm and the high number of external URIs suggest an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://yourhandmadeitems.com/userfiles/file/zedidixis.pdf In PDF document text
    • http://misr-consult.com/userfiles/file/33839361261.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/74538721171.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nanubolitezokukugemufif.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nimavafapixijomukegevini.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091214104373499.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/94603620047.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/67554691284.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/gafenoxuzademudu.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/40884535976.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/71257212816.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/kanuwajimekituxusiso.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109062036295751.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf63948bd---kevomomobit.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b0330299---93508839960.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/fetupakepijeximofebivegu.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/wonufirulul.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/mimadamigasuzejovogular.pdfIn PDF document text
    • http://banquat.com/userfiles/files/totafanesilab.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/60521878142.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/pawugakuzalefe.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/zikefowefev.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/38138201795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=isometric+dot+paper+printablePDF link annotation
    • 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_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10764 bytes
SHA-256: 6501dbca607b78e6e22ff60e5412a2ea1e4a5e73825a34dd618c2311fddc405f
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 17264 bytes
SHA-256: a42d6e7277db96aee78d10ad8964b9deffee4ec5f69fe48abc7a4bae288b730d

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