Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ec9b198b71e8b3…

MALICIOUS

PDF

96.2 KB Created: 2021-11-13 06:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d23c147de71f17ff242178e0cb94f475 SHA-1: 283a41a27726b1375f2b06ebd0ed568c3944f439 SHA-256: b6ec9b198b71e8b3fe152f4c229f0ae494efcd1e8c9b19c21355267cd74d9152
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host many links, likely for malicious redirection. Although no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://video-cycling.de/files/file/vavatibamudakinopafig.pdf In PDF document text
    • https://rabudiagnostic.com/userfiles/files/45242227561.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/fenakudazukuvilomu.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/bekufofomi.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/jozuvanixoduvigurufopig.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xenuxatibuzarofesusur.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109172156304606.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210924123617.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/21634304171.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/42488673688.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/rukomopowuwaxu.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/lofuzopoguxukolivazopaku.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/93408367688.pdfIn PDF document text
    • http://aven.su/userfiles/file/87813579561.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/julipilexulinojubafimam.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/67471853161.pdfIn PDF document text
    • http://generaldistco.com/images/file/dodamuzolexiziwawuv.pdfIn PDF document text
    • https://luminex.pl/upload/file/gutunusukipoda.pdfIn PDF document text
    • http://synphabase.ch/upload/file/36032689684.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/dudofefos.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/sidumonabesu.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/29383045943.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xizipusiv.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/dumatorifikasowesiwiler.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=cavalry+southern+crossPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 25000 bytes
SHA-256: 14fb68b5b82bd9fd4367a00a1414f26b91e0240e21615ab2bbdcbf1981acfbad
font_02_sfnt_off00014b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5B 3960 bytes
SHA-256: b833d6a23f672eceb2f700bea66493f96fef0698e7b36392ab616d7b845ebff2
font_03_sfnt_off00015abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABC 10548 bytes
SHA-256: 6de8b2a62df3e47f12fe713904c7181fdf6a9d1884ed81d5a5b4649ea41ace62

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