Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca12efe077acdc97…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 05:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca2b5d9525d418a83fc63c45a92b4a7b SHA-1: 37a9c76399013eb77ad565e09a57389903a796e4 SHA-256: ca12efe077acdc97face6e6ea835560b9025635b3c1bcb5cca07b288e1fdd044
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a likely attempt to redirect users to malicious content. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://zkmeiqi.com/admin/ckfinder/upfile/files/nezolutu.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/39228422222.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/65510224640.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wetogawaka.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/wulidaduw.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/36651284061.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613451e55a4ea---69906742687.pdfIn PDF document text
    • https://italvaping.com/file/zujaf.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/takesonezil.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161313d2b596fc---rutigezekebewu.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/golezesemetolitilivusumo.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/84742039636.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/dabalolid.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/76745736924.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/56861416251.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_232525.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/kined.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/67621670684.pdfIn PDF document text
    • http://dytac.hk/userfiles/bukukojavuwozedujif.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/bilakezobazoxewelaso.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/kusizemekaget.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/wopivilaxejafedudit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+recover+deleted+files+from+android+phone+internal+memoryPDF 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_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 11140 bytes
SHA-256: 0fe6533c5b4f0c1024abfd59b49478624bc821fbd9bd3831c42c93a5d307fc34
font_02_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 15356 bytes
SHA-256: 4925c748898d0855923ace0b17ad49eeb6dd882ae03cd2fc96fce6e171c6b172

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