Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fd727982816340…

MALICIOUS

PDF

89.0 KB Created: 2021-09-10 04:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b1b25f20fe08ac7fb71f5e883105050d SHA-1: 10acb322a8fea3a184e29d755f8b6136189beb57 SHA-256: c6fd7279828163401ca32d01c7ad7e2de0a50c80e75c706f28a3a4c4066c9a55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://lixtech.com.tw/ckfinder/ckfiles/files/13438841193.pdf In PDF document text
    • https://verticala.ro/images/userfiles/fujexuxobibipe.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/79436960567.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/61255755768.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/22273195906.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/28481798400.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904223304_1263250668.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/967000668.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/dawifubafudifaji.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jamazufivatekujudigefe.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/jizuramojikam.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202195951202478.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/13799112802.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109050925301252.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/jakisevar.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/58419275229.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/goperer.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346089d503c---41335276406.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/xigurubosemunipukafasenum.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/sexisirifogaxikezaf.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b0a65a37---lopoxobinazanomizuzuxaf.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/27100428758.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/20329621456.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/rabapewaputiraxokev.pdfIn PDF document text
    • https://onecre.com/images/content/files/gelidofesajorozerajigif.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/pijamedizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=raees+full+movie+online+watchPDF 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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 17596 bytes
SHA-256: b3d16c87dac70da225e910be1a71a308a4ffb398f53f86a94a4bd1e4988d0ad4
font_02_sfnt_off00013dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBC 10800 bytes
SHA-256: 7e46152bfe86b0f2bc2dee399f052d98e314756830cbdf83c8476ac7b87f6b5a