Malicious PDF — malware analysis report

Static analysis result for SHA-256 167835bf84955389…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 13:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 830b48ee7aff98c457a40bbafe0962d9 SHA-1: 74806218de6dbce816beff22b11460982ddc6835 SHA-256: 167835bf84955389a53990e17b95f9fba0addec42604e31f3cd276bc40bf9c7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on 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. The embedded JavaScript is a common technique for obfuscating malicious links or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://avvocato-callegaro.it/public/file/97391782283.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6ebpn2dfj3rku7kapd8i4a24c3/14963858940.pdf
    • http://gapp.fr/medias/files/kapekota.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161304f57565b5---lubenanoxo.pdf
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/44781100130.pdf
    • http://keystoparadise.com/userfiles/files/gusipemalanuwapativim.pdf
    • https://loctra.net/userfiles/file/nowizizuzajipokosutipivi.pdf
    • https://leo.tw/upload/ckeditor/files/69272722690.pdf
    • http://sambometal.com/dataroom/file/gakugadubutofidusigi.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/5461870870.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/pemalikapefe.pdf
    • http://zechnerbau.at/images/content/files/ginipom.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/diwuzowegiropolikojebo.pdf
    • http://uniquecharacters.com/upload/files/kafogujivekaponi.pdf
    • http://horizonpestservices.com/userfile/vitabadefegapa.pdf
    • http://goldstecq.com/userfiles/file/pixijosozezuboguge.pdf
    • http://zdrowejaja.com/Upload/file/xibatipugofis.pdf
    • https://al-farh-iq.com/upload/userfiles/file/japibiwaxekazegunivixe.pdf
    • http://www.radanhorse.com/resource/files/91857344302.pdf
    • http://tchid.net/userfiles/file/65026862418.pdf
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/lapuweza.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/75703395060.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+salaam+namaste+full+movie+online+free+with+english+subtitles
    • 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_off0000ca91.bin
40e340d5be462e76de7feffdc0a56d4d38a9737c252ebcaf1972ee5a267e26fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 11168 bytes
font_01_sfnt_off0000e48f.bin
3091b6ce7da505d867855398c5fb0552d5ce370513a6ddcd7449825c2d46e6e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 17424 bytes
font_02_sfnt_off0001118f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 16792 bytes

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