Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f614c18cfec764a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 08:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4dd4c326a9d878e6de10ed52b140bca1 SHA-1: 164d312d4dc620925037c13ac56c61c06bd41884 SHA-256: 4f614c18cfec764a3af44918369c2a7edd5ec1413ba7a1b9f3d61785434f473e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that redirect to various domains, likely for phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern of using disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cructi.ru/uplcv?utm_term=american+horror+story+season+3+123movies PDF link annotation
    • http://tfforming.ru/d/files/zarokefetit.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ae56c5971---14934001881.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/kokagofex.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/gisujajun.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/wogerowejurato.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/lijofazidose.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/42429443018.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/vesajesaselal.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/fawibejekojuxixununo.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/xemoveno.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/wuner.pdfIn PDF document text
    • https://soechi.net/userfiles/file/65192231328.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/69061775075.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e675b32a---winet.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/guxeliguwodasige.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/3188291520.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jexunekugoxa.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/waniradosobasumegebubi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/80090150957.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/87978854078.pdfIn PDF document text
    • http://santeh.md/img/files/rogataz.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/43454609697.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_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 19040 bytes
SHA-256: db984b2c31796dab69ea245509f09eef44ce2135e7933fb7aaf037af978e77a6
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 10952 bytes
SHA-256: 33f91120a301a54e3872adb1fa16495181446b7d06a9bc013e67c37319c717a6
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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