Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da4ce445a5d0697…

MALICIOUS

PDF

68.8 KB Created: 2021-09-15 20:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 991417ee38306e43c1afa7ba38d9378b SHA-1: bda037b7d57efeaf48811b40266829c76238b4bc SHA-256: 5da4ce445a5d0697c297d2ad07d6deaac50d2617e4950d84ce706820b478c970
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://besttailor.info/ckfinder/userfiles/files/67132156136.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc100388d4---46452970467.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/20797566893.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/fuwowuvujebaja.pdfIn PDF document text
    • http://sdes.in/uploads/kurivuwijexotuwaf.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/bimurojigapuranotukile.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/75999524103.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/sowurabirobovopedodojukob.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/bigetuvoxebanojebawoloka.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/2730983893.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/94734269346.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/20379276579.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff505e36a2---lotusadokemomasawe.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/binuri.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/30553797898.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/26516620901.pdfIn PDF document text
    • http://okvin.org/userfiles/file/37781919459.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/93470640257.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tosotanodeg.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/71230806460.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///somus.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/29438282585.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/zogoziber.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/weniwodiwaloven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=my+girlfriend+is+alien+episode+28+english+subtitlesPDF 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_off0000aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 11452 bytes
SHA-256: 1401eafdd9e3d03088ce1803761d3c1e214507a2f62d3503bf2e330a3bcfc3d6
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 14264 bytes
SHA-256: 265af9864018dcf668a92bc48ef5b6099fdad57e4823d04e2f0837771826b75d