Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbfab5143912412…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 03:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bd828ff26880c2c3cd43dc878e0e381 SHA-1: ff5a2e36efd57bbd27c95e6ebaaf58d90513995b SHA-256: bbbfab51439124124c7ff1f9be8be630099d70d7b6b9c95fc6ddd1b1a786cfca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on potentially disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smartech.lv/sites/smartech/uploads/documents/files/55638302660.pdf In PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fewiweruxepobanetulagux.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fomekevapanimuvumunibid.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210924101325.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/pugazaxori.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/zaledinibisutotorotis.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910230429.pdfIn PDF document text
    • http://serting.eu/userfiles/files/suguzoku.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/52295339577.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/16797628655.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/81025616148.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/kokifinadunasedibe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161365b9d0f8d5---nanowowuluta.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/94240591899.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/suxidirolapevataxodinozip.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b08fc0a99a---1556493564.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/41242424463.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/72992832569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+secure+a+folder+in+androidPDF 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_off0000abbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBD 18356 bytes
SHA-256: b7015e26c988cbdae2b25cf74401ed457bd939e690c6be0ec9d38111092750fe
font_01_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10644 bytes
SHA-256: d0c17de64d1457204e0a5aa499c05b1da48ffb3d015b9ed0e4034d2233496009
font_02_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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