Malicious PDF — malware analysis report

Static analysis result for SHA-256 da72de676eb180f5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 19:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51a3d4f199aeb467438ffa89d589d83e SHA-1: 6c69f5674484b6eb92e6c200b669063008426cf2 SHA-256: da72de676eb180f5f4ef8ccffb5e2dae4fc1e35c3bc6789595e786315ebdf2e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, with many pointing to PDF files hosted on various domains, suggesting an attempt to direct users to malicious or deceptive content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ropesadventure.com/d/files/74641601189.pdf In PDF document text
    • http://hc6999.com/userfiles/files/29312275299.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70346357221.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/dafurozoruzapave.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/89856428273.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/ribitezirokexifeteko.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/47209988730.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/58665437514.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9ee6816cf1833d43b19796d814c018f7/jokujexejir.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/82000186641.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/jibumofazipi.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/7747131716.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/34079043750.pdfIn PDF document text
    • http://warehousetraining.ie/images/fuzopo.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/54385567964.pdfIn PDF document text
    • https://asiapharma.la/files/files/91263986432.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/danudezemezatinux.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zilebexodotofobotinovem.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nefugoponetuzedo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16139c522374b0---zopetiwiwigeretineranekaf.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vmsrmih7etoodl80vqs1vls4c0/88414799288.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/14617816874.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210911101812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+m+connect+plus+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_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 10760 bytes
SHA-256: 6f9711e911948ceb2094ebe7951b07f50aff1748513930557c98b4b656809070
font_01_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 18224 bytes
SHA-256: 644563f9b99bab573ef1e8a52be4916b1dee43040d331d5e578449d4f8d5d7fb
font_02_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1