Malicious PDF — malware analysis report

Static analysis result for SHA-256 9095f0713683ab2c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 04:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4df77a48de519f5a63af20db8a64dcd5 SHA-1: 5fcf00b8f85abdaeb5fbc4153be5d8f8eb77e07a SHA-256: 9095f0713683ab2c48bfef0aa1d8188af82fe2f4fe721b1069e5490c4ea0d135
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a redirector on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format and the presence of external links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=boku+no+hero+academia+watch+online PDF link annotation
    • http://pacemakerpressintl.com/uploads/assets/file/desagafumuzak.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/70680916164.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/kikevowovet.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/51781634700.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/87445314102.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/54784860575.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426cea3f05---65476684944.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/51929538596.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kumanoz.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/53635941261.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/25082538761.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/tepov.pdfIn PDF document text
    • https://norservis.info/files/files/63302515582.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/gujinabaki.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/kazajigafezotabota.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/remilikegisud.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/zobikitixupulepa.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98634674379.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lejajawelutupoz.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/65001996106.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/25791316814.pdfIn PDF document text
    • https://phukienbep.net/media/files/derenexivofatokemerabapo.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/68883630859.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/82392871383.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 18168 bytes
SHA-256: 77341bad2c0e9450c138586c7637c0f1b832d78c7da59c75a7b661c68de88650
font_02_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 10800 bytes
SHA-256: 3c23136029ea6df387af5108dfd2467aafa823a5aad064ce653c8b49898a0fff