Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf9d083a7d09ad7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-23 12:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64e59bd48eefe5e15964ecedf66a771f SHA-1: 4cb0ab95bb149f099e3ed912b576567251ac581c SHA-256: eaf9d083a7d09ad723a9e0335ecfd9f53be7ffe1889bda8e09faf866f4e7d073
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for links, further supporting a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab909ede0---56907552557.pdf In PDF document text
    • https://mr-alian.com/upload/ckfinder/files/84395081890.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/72442205817.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/nepulurafamod.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/zadafegokuvap.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210907_073207_4549.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/47841644279.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/36777499467.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/sajebider.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/91080722482.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/9175779702.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/56161045271.pdfIn PDF document text
    • http://sadvita.lt/pav/file/towuse.pdfIn PDF document text
    • http://15881588.com/ckupload/files/nulowogifugidibojodevubo.pdfIn PDF document text
    • http://etkenkalip.com/files/gazafuwuwalodiveruduseko.pdfIn PDF document text
    • https://istanajp.com/contents/files/dowejujazepibaluje.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/borurasiduxegokejib.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/41416050532.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/76827335638.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/togikuduw.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/96060231427.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614257ff141ba---nijibefot.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/kadegigaxuwomiwuzapotudor.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/30504637004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+chromecast+phone+to+mi+tvPDF 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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 16532 bytes
SHA-256: 72c452993217c643c215e97db62194c3707919a9e8ba9b5a5a60e53043668af0
font_01_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 10736 bytes
SHA-256: c6a1ea76e965ab62c39f9b641ef086de8f7d6e776ce01bbcc97894e72cd0e8f0