Malicious PDF — malware analysis report

Static analysis result for SHA-256 48caca38d9381e6a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 00:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e3d0b2a1d43f7213b8ccbcf4d14fea4f SHA-1: d066fdc43d51ecde91be3c1f058eed8a2fa61aca SHA-256: 48caca38d9381e6adbe92faaf39aa4b003fe9874109140346ad7dfd1f8ae2cfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, likely to distribute phishing content or further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://huntic.ru/uplcv?utm_term=real+gta+v+mobile+game PDF link annotation
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/bokelutaroxid.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/tesuxirigemuwebiratetafu.pdfIn PDF document text
    • http://tcihk.com/userfiles/wuduwatojujilalot.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355a2a6f2d---99600540898.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903193237112.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/35432523477.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/nuzeruxakeripibebiw.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/renuwawomotaresetakus.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/78667158477.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/70788797349.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kumiloxokogevoverobus.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/49071034397.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/94757440306.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/97111920222.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/45384927047.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/vawuxotimu.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/mukosowomiziguma.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/79657959372.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/xiligidu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/24561503993.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/81259227882.pdfIn PDF document text
    • 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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 17940 bytes
SHA-256: 2da94620aee7d5bc9d2419d22d9c29d4c30013fe72fd42889b8f395d2424695d
font_01_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 10328 bytes
SHA-256: 36b6c4d504302f0c2be0ea97f3583ffa03e393e29d17cda7a4693c253a92bdbc
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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