Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdfa34ac5f6704b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 01:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 54f17d49d980e47bee14c97485f6691f SHA-1: bea7badc94bfe62e43a58fe5ea9e6874e12e233d SHA-256: ffdfa34ac5f6704b7fef256b844b285f6413ba47bcb07abd95e004cf988ffd5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=it+chapter+1+full+movie+in+tamil+download+tamilrockers PDF link annotation
    • https://ncvpte.in/userfiles/file/7671494957.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/95074327529.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/xusogovali.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/kitaza.pdfIn PDF document text
    • http://fohow77.ru/upload/file/53445445870.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/15081014932.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pabixeminogijekipo.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/kiwijavufakonameden.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/majujovasakuvug.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306ab982e38---29891336935.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/78110292001.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021092703060873499.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/43154124322.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/dopik.pdfIn PDF document text
    • http://hibertek.com/image/files/20210921_142025.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/lejijenusoxogowegoxito.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/gosogofoku.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/tobubejuwikizugukukimiw.pdfIn PDF document text
    • https://digireg.gr/upload/totoguzijeronojor.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/56374847006.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/lotasideme.pdfIn PDF document text
    • 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_off0000af52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF52 11232 bytes
SHA-256: c961f2fc3a135f7351058628113ad7c192bb5f9c7256740d9022911939995916
font_01_sfnt_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 17168 bytes
SHA-256: 2599ef24015cb30370348e00907ac3fa8d4e7a08de8f23849409970e17bd2a90
font_02_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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