Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7118b586a4f648…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 10:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ada9285dd017b86787f4e0928f3a94b SHA-1: ebe5ae754591abbea02aa2854a478de59fab9b6f SHA-256: 1d7118b586a4f64879590bfde9fb01f2d7a09eae0fd9261aeefea648dd1fa6ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous embedded URLs, including a link farm on disposable hosting, suggests an effort to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smepil.com/ckeditor/userfiles/files/godexomuvixuwosepen.pdf In PDF document text
    • http://ihanzao.com/userfiles/file/20210909065502_1240899602.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342412e1b2a---23926488746.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/34039772364.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/tibobepotuwe.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/30296304566.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/72475996263.pdfIn PDF document text
    • http://foodchemsino.com/d/files/51186059668.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/riraf.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/vukogavagifun.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/riburunumulemirim.pdfIn PDF document text
    • http://elitacasa.it/images/file/22276414596.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/suzapefiregibise.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/65273198388.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jezafoxatatifumaf.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/19516431865.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/92135276537.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/vupijamosefunelafu.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/jatisinosamam.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/90675899380.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/jebisom.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/05/dilamijiwumifexuruso.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/64m8a55r8ieidb2s74b0v30144/39681064420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=buggy+racing+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_off0000bc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1D 16632 bytes
SHA-256: 9b311f14a82fcc14416782654135f5e8ec269447b965122bea047319ce2fc803
font_01_sfnt_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 10772 bytes
SHA-256: 4ddcb34bdc6388d6df1ad6f1ece25a1995bcd7166616a7c97c8030516042c462
font_02_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1