Malicious PDF — malware analysis report

Static analysis result for SHA-256 755ed13e799a165c…

MALICIOUS

PDF

78.6 KB Created: 2021-10-09 05:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92d4c4f320583b171f034f51389c16cb SHA-1: 5b23da663ef53e6def21882d19898c06fcb43909 SHA-256: 755ed13e799a165c904e2b2269c9b656127f968c7e7ddf3097293a90eed29b84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many pointing to disposable or unknown domains, characteristic of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is intended to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://cfbadalona.net/ckdata/files/31675382818.pdf In PDF document text
    • http://uk-finansist.ru/userfiles/file/gowokeji.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/nivobulazosujaxujijajer.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109140003106164.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/sawatozetaliwe.pdfIn PDF document text
    • http://ttc-investco.com/img/files/27448636130.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nobowafono.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/43698856636.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/fazobuxusaruwa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee7e3c75---84432221315.pdfIn PDF document text
    • https://aneri12.eu/res/file/93655915279.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/depunexakubiruravaz.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/welevonotojakovor.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/logijokenudap.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146a5bc45d93---85862002101.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/regeguto.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/37135329414.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/jofadoxasij.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/43967232202.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/21962370122.pdfIn PDF document text
    • https://geloracinta.com/contents/files/93361393285.pdfIn PDF document text
    • https://interconformity.ro/images/file/vajuseb.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109252310256427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=differences+between+electrolytic+cell+and+voltaic+cellPDF 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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10876 bytes
SHA-256: abf1df921b9709a17e7885e3afe9c21217a328c80313d8c5d3f5df3c2b389c90
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 18080 bytes
SHA-256: b3d978cfdf2ec13399a038ad19d371b35c1fed3891c495fc2fca46178b9a33dc

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