Malicious PDF — malware analysis report

Static analysis result for SHA-256 c828db4d73712b1b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 02:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87b4c6d29106820e858a85feb600cff6 SHA-1: 9b8c83f796889c03b77545e079650abe913f2293 SHA-256: c828db4d73712b1b7aabe5164f084599ec4cce02a7c6ee1e7d6f9cb22512fdc9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and external links suggest the PDF is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=4+player+android+games
    • https://biocoils.com/img/file/rutidewimuweferilivo.pdf
    • http://vinaktv.com/storage/ckfinder/files/fuduvowevetoze.pdf
    • http://cmrivestimenti.com/userfiles/files/bixomazi.pdf
    • http://briquettemachinery.com/d/files/rodod.pdf
    • https://mimpishio1.com/contents/files/dikit.pdf
    • https://yuanfuconstruction.com/ckfinder/upload/files/sigodafimoxapunedixa.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/zewodaxexaduj.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/vitaza.pdf
    • http://myucmas.com/userfiles/file/ropetixebinikade.pdf
    • http://szsahsh.com/uploads/files/lopidikojirutazokadog.pdf
    • https://takarasushimn.com/userfiles/files/20115390958.pdf
    • https://egokituz.org/files/galeria/files/sovapejozedojudafutuxugin.pdf
    • https://atlastoursntravels.com/userfiles/file/83679753230.pdf
    • http://juha.be/_files/file/79715472384.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-15-13-37-49-38.pdf
    • http://foxgraphics.paulsfashion.in/files/88601577851.pdf
    • http://andrelandberg.com/userfiles/file/42082238715.pdf
    • http://www.rajpuc.pl/pics/file/61133809525.pdf
    • http://luckysim.com/userfiles/file/timabo.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/88484008586.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/badigovumiwuk.pdf
    • https://sunnyrosesschool.com/userfiles/file/rapuguwununilufime.pdf
    • http://dtyxbpzx.com/filespath/files/20210902002935.pdf
    • http://school19-zav.ru/userfiles/file/93752830626.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1f8.bin
e7c374ccf26c534253f25a8ce1adc39f879fd098e776d998c874511f67da3086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10732 bytes
font_01_sfnt_off0000ca61.bin
f3250573db235c70f7af681c53ac676c17106e17e835c07831ccd77c0c773f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 15128 bytes
font_02_sfnt_off0000f0b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 16792 bytes

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