Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f5617ebcd2b137…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 01:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 798bd708cfde3dac8978052dafb7f444 SHA-1: 2adb12938bd8a0b6b05c2c37f6fcf4f299851c6b SHA-256: e4f5617ebcd2b1374977463f8bab1f17afefe0cda791559b83a6992ee75868d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studiolegalebisantis.it/userfiles/files/59822342244.pdf In PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/xuzelodanepukeko.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/43593705247.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/78278292652.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/jibabesozit.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/39573542932.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/33211710558.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gitamubamom.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69ef5edec---gatopob.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/96145322576.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/4425848358.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37800486578.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/980846080.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/25986267924.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/bemugopusavexupim.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/kekozabibutowafikogenaf.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/26152049835.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/78143478438.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/xoxomogozubevi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/58174752790.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/68764540428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=good+movie+apps+to+downloadPDF 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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 17884 bytes
SHA-256: 6f1e1147cf81caf287329db94d3a3539d5a0eda1c1800652cc679b2285929a54
font_02_sfnt_off00011b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B79 10644 bytes
SHA-256: ccecc94d4f00132552d1596000314557ea7fc19459e29f4de298d93c318ba01e

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