Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9512fc77991b84b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 05:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75eda44424cfd4c9e6bd15ca169eee4d SHA-1: 9aa3e233df76f4c158791d6546bdc18935767cba SHA-256: e9512fc77991b84b89b8ffda973c465e72af4656f40f6d6746335a415cfaec59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of external URIs and the overall structure point towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://metalzilembo.it/userfiles/files/50253572174.pdf In PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/36790698088.pdfIn PDF document text
    • https://majubesar.net/contents/files/7844791478.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/zonisiwewuwukafoletaxibi.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/28955719365.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/34277005067.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109170759153534.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/82107276000.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/65796044217.pdfIn PDF document text
    • http://zenithmetals.com/files/zirisuwaxet.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepafoziximutosefebab.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/xibosipanogonimekutenukil.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/45647369261.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/50775968409.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/66354055127.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/dotipet.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/80850246199.pdfIn PDF document text
    • http://expresskaliski.info/file/gowalemavokobo.pdfIn PDF document text
    • http://czyxchem.com/upload/files/53248654584.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/vizemader.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/viladesogojupit.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/90433870618.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/wusotixamutejigigigemas.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04d7da4aa---kojodavuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spider+man+far+from+home+full+movie+mp4+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_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 18568 bytes
SHA-256: 4d4c7da4d1f80647ffe71272b89de1b9f0b311bfe026838ca53fcf81fac935de
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 10900 bytes
SHA-256: 06fa5440264b45b2fc94590cd9987a7c7ad61f404c526687447dda45a51dd524