Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40bd802a3a899b8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 14:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 43a33b0c7f564c8f1f60266c060b021d SHA-1: 60562ff80405325d4ec912bf5f3f94b555c3f412 SHA-256: d40bd802a3a899b882ae0bc6bd422cf54e4bf4af86ced0d11840c3eba4241a45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, indicating an attempt to execute malicious code. The numerous external URLs, many pointing to PDF files, suggest a phishing or credential harvesting campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://garage-fuji.jp/js/upload/files/bigit.pdf In PDF document text
    • http://pttaccounting.com/userfiles/files/pakexusapigakutor.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/mevolebes.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/25599510255.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/37134123620.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/85577402951.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tamapumevaseruxuxijipeg.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/fomotawasodivesofesiwugaw.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c78b7100aa0fb0dca1828d1d65cba83/6808851106.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/21599396849.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xulebomodinivolazan.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/giretoxeminubap.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/dovifejizi.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/wifowuliwexumopo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/fevunufiselagog.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/74516374206.pdfIn PDF document text
    • https://nasikampung.info/contents/files/mumabogevawozavuwezapojal.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/rupime.pdfIn PDF document text
    • https://airbays.com/userfiles/file/42391954392.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/degivorazofenuwuvam.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/wukuwevejalavawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=batman+wallpaper+4k+for+androidPDF 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_off0000c574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC574 17608 bytes
SHA-256: b737615d626a10f869d10f6a278716cdfdf9c4856dfe9f337bd17122d4024916
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 10800 bytes
SHA-256: 30a21e385f5863d1aa61256dd310589f2d3050fda0fd2d09f7b86eada6ea44bc

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