Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e86baf4da5a46db…

MALICIOUS

PDF

79.3 KB Created: 2021-10-17 13:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37bc9c8b46387c2d5dba8665f407cdb0 SHA-1: b4f5daa203663852c61e6afc56b89a30560d1abc SHA-256: 7e86baf4da5a46dbe4e45fe76296692104b8024c24d1e3a4177f21842697cf64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ls12368.com/userfiles/file/jebezujo.pdf In PDF document text
    • https://gymlesgeants.com/upload/editor/file/gupabixi.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/lidanirazasizuwamol.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/93883745002.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161352bdb3473b---zibedavigifivodikaka.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/65358539921.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/gumepememamerezadoxatej.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/tudariwomepafilizalodip.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/39159705707.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1615e6647976b3---ziragolinunenimepivelina.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1632003698.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/neloximevej.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/72804335634.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/95324446142.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/99614533615.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/99027002110.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/89829160221.pdfIn PDF document text
    • http://atrax.hr/files/42433746764.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/20238380265.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/84631906238.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/dijewufizezoviw.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/sejadidafogosi.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/98595485918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=environmental+practices+examplesPDF 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_off0000d1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 17248 bytes
SHA-256: 7d27aaddd5a5f4fbd0caf6c7113f241386e36979c0b655d9c5f68abb1ce9c01b
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 10684 bytes
SHA-256: 6288b3839af205696378029f9d3b520b4f8809be09de004320f87ecb1f6fbb61

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