Malicious PDF — malware analysis report

Static analysis result for SHA-256 2104b00b51c5d5b5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 07:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be2cd4ecc1b223802b6e9ec9d1d77764 SHA-1: 98979c9b501fbd2a5eddcf759469c34819e94609 SHA-256: 2104b00b51c5d5b5b4321349224f4f266e0da98739783a456533d0d9af3c5bfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, with many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gz-theoutfit.com/UploadFiles/FCKeditor/20210909090549.pdf In PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/42854570254.pdfIn PDF document text
    • http://skrn.cz/pic/file/55651140735.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/rasabakukurokuda.pdfIn PDF document text
    • https://simorgh.it/uploads/file/14409563538.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/zeranetenu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec815ac62e---xusumafodozan.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/79067579216.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/26915669574.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/moveposovexutasetadixa.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/90441551204.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/mipaxowawupejubomawip.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/12185533089.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/69211488959.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/60960035011.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/1131826263.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/kubidibojekuwatepur.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/kuwefinojisese.pdfIn PDF document text
    • http://salwex.hu/file/taguvasanositudamitaw.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/65962612350.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/42157774009.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/xejiladobavevufifevub.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/98665962392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nutaku+mod+apkPDF 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_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 10080 bytes
SHA-256: d5214fb7fff65b182a63bcf4075383ad67806d56518fd7a8539de98bf66d1bd0
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 17352 bytes
SHA-256: d93c02406b1f32ff4af4fc3387ed86c127db0b1cdfe08c9b557bde02d7696175

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