Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09e8e5c31ab4eb8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 03:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 749a1dbe318c3149159bd3ad56209bde SHA-1: b1afa14201aad35d93dbb41d1adee318b897bc57 SHA-256: e09e8e5c31ab4eb80a3775bdc130ce0d033510acb5cbccad471e88ebb038d1a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. While no scripts were extracted, the structure and URL patterns suggest a phishing or spam campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • 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.
  • 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://mn-print.ru/ckfinder/userfiles/files/ruwoxevuku.pdf In PDF document text
    • http://ambulanceservice.pl/userfiles/file/mapufekasamepirom.pdfIn PDF document text
    • http://cke.hk/userfiles/gijubuzepizaxilema.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/lolomeluverigego.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/24739710514.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/38156005687.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/sederunixaji.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109120022589102.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/49405240269.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/bipawuvozaludaver.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/11875418116.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/jujitodajutawero.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18109830180.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/luboniwiweriwuxik.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf62c2a78---lenotanamesinijot.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/muxav.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/5363797418.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wodoviwepaf.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/36766177087.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/bewuzunezarenel.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/juravimuwapotufudikeka.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/12131810771.pdfIn PDF document text
    • http://hflchw.com/upload/file/lovobe.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/44592732685.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff52ae7bb2---janamonigekegube.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/betobazesolidutibaponevux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+delete+multiple+contacts+on+android+phonePDF 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_off0000b3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 15480 bytes
SHA-256: 0016228f282d2a3ac8b67cf31d29486a36244492fca28eb891990598a0167646
font_01_sfnt_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10956 bytes
SHA-256: b1cfcc901abc250b0c74bf36ada4b07ba2696b03b005b8bd5db672988662b4a3