Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe998410285f8125…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 00:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f898d6ebe371d56a6f9292dedacaa9b SHA-1: a7d0e855577a25b266462c2fdb6dc846799b13cb SHA-256: fe998410285f8125c0e076dd485891b31a6db8f56b9483d4be1a4c9d917ed3bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://laborke.ru/uplcv?utm_term=minecraft+pe+0.4+0+free+download PDF link annotation
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/55876187728.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/dodaxi.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/rajeko.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/virixusegeribewewuf.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/wosufefupejep.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/lajemupopigetefeto.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/68712316604.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/katidezavilor.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/23658395341.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/widafokoneg.pdfIn PDF document text
    • http://sbkf.org/files/files/95554531499.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/fobazimonekug.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/41923465249.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/bikesazogob.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/10584737091.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zakuvugudifusolakupopur.pdfIn PDF document text
    • http://jfe.hk/userfiles/vevawevozuvesurikexub.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/finelisafedetaxutovozamo.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/97142249418.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jijebupimuwival.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89804705852.pdfIn PDF document text
    • http://101balkon.ru/upload/files/49453646869.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dubex.pdfIn PDF document text
    • http://yongqingtech.com/d/files/51988420679.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/futesome.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_off0000c0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CB 17668 bytes
SHA-256: 6f3585ae6173f45a99efa59b1335ca24ad3db8d81dd2cf6246f9b4a0f72626b4
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10788 bytes
SHA-256: 1083fa5fbb12d3e509b78d923bb9298b37b379045563ccb410451ed542493364
font_02_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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