Malicious PDF — malware analysis report

Static analysis result for SHA-256 f900d7deb2fe94b5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 10:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9bb7feb50d841194c9b0609439707b5b SHA-1: 4fe497c87d4910cdf06b839ee31fc8fcf434494d SHA-256: f900d7deb2fe94b567ea29428bccfbde3e4dc614f88e38653ad08e88a81348d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs, many of which point to potentially malicious or disposable domains. This suggests the document is designed to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f68735a4---kemibomumizeduxa.pdf In PDF document text
    • https://blugarden.eu/file/fobudokulazepopuziwofo.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/69810050623.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/47433589021.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/39153124136.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/59701693444.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/rerunajopasagidog.pdfIn PDF document text
    • https://ntc-container.com/upload/files/98941098607.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/26940456626.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/sigiroremipa.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/88330975303.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/vegogozokikamutij.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/kilakuzimomasaluma.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/xuvejijogedesixoxogili.pdfIn PDF document text
    • http://popmetre.com/news/files/xukalogokifa.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613c43966fb78.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/xoxasekajuxipadozaraj.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/32110067877.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/bidowagupobuvamimugena.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138ace880f48---23231094422.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/79907746831.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tapuzakikamiwukoraru.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/654203189613ff8e1eddba.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/51408232677.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/38296718307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pocket+code+game+downloadPDF 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 10532 bytes
SHA-256: 99403da00b4e27fdc67fd269cef7d5587c81dd32f1bb6a694c92fd952646cb23
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 17880 bytes
SHA-256: 02f501bd1483ccf21f02e2542a4ea7f5ec23d50609c45e5ccafd4bf29c96ec1b
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1