Malicious PDF — malware analysis report

Static analysis result for SHA-256 4608c1387504db38…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 20:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 068ffd371bb9ffd196c5abd612d10c13 SHA-1: e59b0a02b325a7b041f5b6120b5f8f33570b1b0a SHA-256: 4608c1387504db3801fcef6738c34e2c8a22f2c303075ab54447b8ebedf9a5b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a high number of external URIs. The embedded JavaScript likely redirects users to malicious sites, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The numerous unknown reputation URLs further support this, indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://bikeid.net/ckfinder/userfiles/files/24439663995.pdf In PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/70436900461.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/72158112932.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/53298225320.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/midibagelasasinena.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/45161477131.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sanijijisobilorak.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/pikosilirebugasagukukexis.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee969408fa---79410552728.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/67792545552.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ipikusurawut.pdfIn PDF document text
    • http://taigesw.com/upload/files/zokafujidujozuvubeso.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/dibokojewarexiwimesizoro.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/jagoka.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/pigezijetomalowiruvefat.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/wanupuno.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/bonulunokilexurikujakulul.pdfIn PDF document text
    • https://dm288.rs/slicice/file/88488769215.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/4707276417.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/33341332776.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/76674393795.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/guxabipiwexomefinorebiwas.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/lipowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+android+look+betterPDF 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 10552 bytes
SHA-256: 3f63a4e4cbc717390fc48ca3906cd5aaf275d5f9ccf78e9fb6f46edca7b6d12b
font_02_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 17932 bytes
SHA-256: 66e7e49ba8afcb4f29e9c520dd876788b8d33ae275dd622bdc120f640ee91bb2

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