Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7cd4a3c51dd23b…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 15:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d64e9ef440bd465647306ba8f440050a SHA-1: 48c70dbc97d1b9ac802924c8c2dc5d377a33b567 SHA-256: 5f7cd4a3c51dd23b9ee734e9d17acd641ada70726f32ddbd81531673c5c09497
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to PDFs hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload from one of the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://centonze-vini.com/userfiles/files/tizuduk.pdf
    • https://malayalamfoundation.org/admin/my_files/file/71472325885.pdf
    • http://wccflooring.com/userfiles/files/vamemabogerin.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/37188761178.pdf
    • https://viadagio.be/userfiles/file/fidumudovenuzesovebututud.pdf
    • http://at2apigroup3.com/contents/files/16302501713.pdf
    • https://rmp-familienanzeigen.de/cms/files/kekevoxiwufuzivisu.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/23985684306.pdf
    • http://kebirbeton.com/userfiles/file/zagewowiwuvorum.pdf
    • http://multiflex.ru/userfiles/file/kizitirunewixon.pdf
    • https://mysmartedu.com/uploadimages/files/rifota.pdf
    • https://anmoul.com/userfiles/file/22421855412.pdf
    • https://hatinhjobs.com/upload/files/12973958231.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/38296441297.pdf
    • https://khonggiansangtao.com/platformecom/img/upload/file/95928796378.pdf
    • http://wx-bm.cn/upload/ckimg/files/202109200035079898.pdf
    • http://allycatering.com/userfiles/bifazesibudugedo.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161415c812b18e---gomupijoregeke.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/dokilaxubupanela.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/popupukijosogewaxitomevo.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/87566925552.pdf
    • https://deniz-sogutma.org/img/userfiles/file/94473352913.pdf
    • http://farmina.ru/uploads/files/pezolaxiritipusolixajet.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+hero+academia+season+1+episode+4+dub
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aefd.bin
ea9aa38d4026f466c4568eb0c4a6ee0dab9a0b49158bd8a6de50e67688fc7e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFD 11112 bytes
font_01_sfnt_off0000c89a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 16792 bytes
font_02_sfnt_off0000e0ac.bin
9717189a2faa574e36c8bed7c95d9dbe4ebe03c71c78b1510e63e8ff8a2794fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 15500 bytes

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